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Month
A month is a unit of time, used with calendars, which is approximately as long as a natural period related to the motion of the Moon; month and Moon are

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Unit of time

A month is a unit of time, used with calendars, which is approximately as long as a natural period related to the motion of the Moon; month and Moon are cognates. The traditional concept arose with the cycle of Moon phases; such months (lunations) are synodic months and last approximately 29.53 days. From excavated tally sticks, researchers have deduced that people counted days in relation to the Moon's phases as early as the Paleolithic age. Synodic months, based on the Moon's orbital period with respect to the Earth-Sun line, are still the basis of many calendars today, and are used to divide the year.

Contents
  • 1 Types of months in astronomy
  • 2 Calendrical consequences
  • 3 Months in various calendars
    • 3.1 Beginning of the lunar month
    • 3.2 Julian and Gregorian calendars
      • 3.2.1 Calends, nones, and ides
      • 3.2.2 Relations between dates, weekdays, and months in the Gregorian calendar
    • 3.3 Hebrew calendar
    • 3.4 Islamic calendar
    • 3.5 Arabic calendar
    • 3.6 Hindu calendar
    • 3.7 Bahá'í calendar
    • 3.8 Iranian calendar (Persian calendar)
    • 3.9 Reformed Bengali calendar
    • 3.10 Nanakshahi calendar
    • 3.11 Khmer calendar
    • 3.12 Thai calendar
    • 3.13 Tongan calendar
    • 3.14 Kollam era (Malayalam) calendar
    • 3.15 Sinhalese calendar
    • 3.16 Germanic calendar
    • 3.17 Old Georgian calendar
    • 3.18 Old Swedish calendar
    • 3.19 Old English calendar
    • 3.20 Old Hungarian calendar
    • 3.21 Czech calendar
    • 3.22 Old Egyptian calendar
    • 3.23 Nisga'a calendar
    • 3.24 French Republican calendar
    • 3.25 Eastern Ojibwe calendar
  • 4 Adhik Maas
  • 5 See also
  • 6 References
Types of months in astronomy Main article: Lunar month

The following types of months are mainly of significance in astronomy, most of them (but not the distinction between sidereal and tropical months) first recognized in Babylonian lunar astronomy.

  1. The sidereal month is defined as the Moon's orbital period in a non-rotating frame of reference (which on average is equal to its rotation period in the same frame). It is about 27.32166 days (27 days, 7 hours, 43 minutes, 11.6 seconds). It is closely equal to the time it takes the Moon to pass twice a "fixed" star (different stars give different results because all have a very small proper motion and are not really fixed in position).
  2. A synodic month is the most familiar lunar cycle, defined as the time interval between two consecutive occurrences of a particular phase (such as new moon or full moon) as seen by an observer on Earth. The mean length of the synodic month is 29.53059 days (29 days, 12 hours, 44 minutes, 2.8 seconds). Due to the eccentricity of the lunar orbit around Earth (and to a lesser degree, the Earth's elliptical orbit around the Sun), the length of a synodic month can vary by up to seven hours.
  3. The tropical month is the average time for the Moon to pass twice through the same equinox point of the sky. It is 27.32158 days, very slightly shorter than the sidereal month (27.32166) days, because of precession of the equinoxes.
  4. An anomalistic month is the average time the Moon takes to go from perigee to perigee - the point in the Moon's orbit when it is closest to Earth. An anomalistic month is about 27.55455 days on average.
  5. The draconic month, draconitic month, or nodal month is the period in which the Moon returns to the same node of its orbit; the nodes are the two points where the Moon's orbit crosses the plane of the Earth's orbit. Its duration is about 27.21222 days on average.

A synodic month is longer than a sidereal month because the Earth-Moon system is orbiting the Sun in the same direction as the Moon is orbiting the Earth. The Sun moves eastward with respect to the stars (as does the Moon) and it takes about 2.2 days longer for the Moon to return to the same apparent position with respect to the Sun.

An anomalistic month is longer than a sidereal month because the perigee moves in the same direction as the Moon is orbiting the Earth, one revolution in nine years. Therefore, the Moon takes a little longer to return to perigee than to return to the same star.

A draconic month is shorter than a sidereal month because the nodes move in the opposite direction as the Moon is orbiting the Earth, one revolution in 18.6 years. Therefore, the Moon returns to the same node slightly earlier than it returns to the same star.

Calendrical consequences Further information: lunar calendar and lunisolar calendar

At the simplest level, most well-known lunar calendars are based on the initial approximation that 2 lunations last 59 days: a 30-day full month followed by a 29-day hollow month — but this is only roughly accurate, and eventually needs correction by using larger cycles, or the equivalent of leap days. Additionally, the synodic month does not fit easily into the year, which makes accurate, rule-based lunisolar calendars complicated. The most common solution to this problem is the Metonic cycle, which takes advantage of the fact that 235 lunations are approximately 19 tropical years (which add up to not quite 6940 days). However, a Metonic calendar will drift against the seasons by about 1 day every 200 years. Metonic calendars include the calendar used in the Antikythera Mechanism about 2000 years ago, and the Hebrew calendar.

The complexity required in an accurate lunisolar calendar may explain why solar calendars (which have months which no longer relate to the phase of the Moon, but are based only on the motion of the Sun relative to the equinoxes and solstices) have generally replaced lunar calendars for civil use in most societies.

Months in various calendars It has been suggested that this section be split out into another article titled Calendar month. (Discuss) (October 2019) Beginning of the lunar month

The Hellenic calendars, the Hebrew Lunisolar calendar and the Islamic Lunar calendar started the month with the first appearance of the thin crescent of the new moon.

However, the motion of the Moon in its orbit is very complicated and its period is not constant. The date and time of this actual observation depends on the exact geographical longitude as well as latitude, atmospheric conditions, the visual acuity of the observers, etc. Therefore, the beginning and lengths of months defined by observation cannot be accurately predicted.

While some like the Jewish Karaites still rely on actual moon observations, most people use the Gregorian solar calendar.

Pingelapese, a language from Micronesia, also uses a lunar calendar. There are 12 months associated with their calendar. The moon first appears in March, they name this month Kahlek. This system has been used for hundreds of years and throughout many generations. This calendar is cyclical and relies on the position and shape of the moon.[1]

Julian and Gregorian calendars

The Gregorian calendar, like the Julian calendar before it, has twelve months:

Chronology Alphabetic Days 1 January 31 days 2 February 28 days, 29 in leap years 3 March 31 days 4 April 30 days 5 May 31 days 6 June 30 days 7 July 31 days 8 August 31 days 9 September 30 days 10 October 31 days 11 November 30 days 12 December 31 days One of Wikipedia's sister projects, Wiktionary, provides translations of each of the Gregorian/Julian calendar months into a dozen or more languages. Month-by-month links are provided here: January, February, March, April, May, June, July, August, September, October, November, December. On top of the knuckles (yellow): 31 days
Between the knuckles (blue): 30 days
February (red) has 28 or 29 days. The white keys of the musical keyboard correlate to months with 31 days. ('F' correlates to January.)

The mean month length of the Gregorian calendar is 30.436875 days.

Months existing in the Roman calendar in the past include:

  • the mensis intercalaris, an occasional month after February to realign the calendar.
  • Quintilis, renamed to July in honour of Julius Caesar.
  • Sextilis, renamed to August in honour of Augustus.

The famous mnemonic Thirty days hath September is a common way of teaching the lengths of the months in the English-speaking world.

Also, note that any five consecutive months (not including February) contain 153 days.

The knuckles of the four fingers of one's hand and the spaces between them can be used to remember the lengths of the months. By making a fist, each month will be listed as one proceeds across the hand. All months landing on a knuckle are 31 days long and those landing between them are not. When the knuckle of the index finger is reached (July), go back to the first knuckle (or over to the first knuckle on the other fist, held next to the first) and continue with August. This physical mnemonic has been taught to primary school students for many decades.[2][3]

This cyclical pattern of month lengths matches the musical keyboard alternation of white and black keys (with the note 'F' correlating to the month of January).

Calends, nones, and ides

The ides occur on the thirteenth day in eight of the months, but in March, May, July, and October, they occur on the fifteenth. The nones always occur 8 days (one Roman week) before the ides, i.e., on the fifth or the seventh. The calends are always the first day of the month, and before Julius Caesar's reform fell sixteen days (two Roman weeks) after the ides (except the ides of February and the intercalary month).

Relations between dates, weekdays, and months in the Gregorian calendar

Within a month, the following dates fall on the same weekday:

  • 01, 08, 15, 22, and 29 (e.g., in January 2019, all these dates fell on a Tuesday)
  • 02, 09, 16, 23, and 30 (e.g., in January 2019, all these dates fell on a Wednesday)
  • 03, 10, 17, 24, and 31 (e.g., in January 2019, all these dates fell on a Thursday)
  • 04, 11, 18, and 25 (e.g., in January 2019, all these dates fell on a Friday)
  • 05, 12, 19, and 26 (e.g., in January 2019, all these dates fell on a Saturday)
  • 06, 13, 20, and 27 (e.g., in January 2019, all these dates fell on a Sunday)
  • 07, 14, 21, and 28 (e.g., in January 2019, all these dates fell on a Monday)

Some months have the same date/weekday structure.

In a non-leap year:

  • January/October (e.g., in 2019, they began/begin on a Tuesday)
  • February/March/November (e.g., in 2019, they began/begin on a Friday)
  • April/July (e.g., in 2019, they began/begin on a Monday)
  • September/December (e.g., in 2019, they begin on a Sunday)
  • January 01 and December 31 fall on the same weekday (e.g. in 2019 on a Tuesday)

In a leap year:

  • February/August (e.g. in 2020, they begin on a Saturday)
  • March/November (e.g., in 2020, they begin on a Sunday)
  • January/April/July (e.g., in 2020, they begin on a Wednesday)
  • September/December (e.g., in 2020, they begin on a Tuesday)
  • February 29 (the leap day) falls on the same weekday like February 01, 08, 15, 22, and August 01 (see above; e.g. in 2020 on a Saturday)
Hebrew calendar

The Hebrew calendar has 12 or 13 months.

  1. Nisan, 30 days ניסן
  2. Iyar, 30 days אייר
  3. Sivan, 30 days סיון
  4. Tammuz, 29 days תמוז
  5. Av, 30 days אב
  6. Elul, 29 days אלול
  7. Tishri, 30 days תשרי
  8. Marcheshvan, 29/30 days מַרְחֶשְׁוָן
  9. Kislev, 30/29 days כסלו
  10. Tevet, 29 days טבת
  11. Shevat, 30 days שבט
  12. Adar 1, 30 days, intercalary month אדר א
  13. Adar 2, 29 days אדר ב

Adar 1 is only added 7 times in 19 years. In ordinary years, Adar 2 is simply called Adar.

Islamic calendar

There are also twelve months in the Islamic calendar. They are named as follows:

  1. Muharram (Restricted/sacred) محرّم
  2. Safar (Empty/Yellow) صفر
  3. Rabī' al-Awwal/Rabi' I (First Spring) ربيع الأول
  4. Rabī’ ath-Thānī/Rabi` al-Aakhir/Rabi' II (Second spring or Last spring) ربيع الآخر أو ربيع الثاني
  5. Jumada al-Awwal/Jumaada I (First Freeze) جمادى الأول
  6. Jumada ath-Thānī or Jumādā al-Thānī/Jumādā II (Second Freeze or Last Freeze) جمادى الآخر أو جمادى الثاني
  7. Rajab (To Respect) رجب
  8. Sha'bān (To Spread and Distribute) شعبان
  9. Ramadān (Parched Thirst) رمضان
  10. Shawwāl (To Be Light and Vigorous) شوّال
  11. Dhu al-Qi'dah (The Master of Truce) ذو القعدة
  12. Dhu al-Hijjah (The Possessor of Hajj) ذو الحجة

See Islamic calendar for more information on the Islamic calendar.

Arabic calendar Main article: Arabic names of calendar months Gregorian month Arabic month January يناير كانون الثاني Kanun Al-Thani February فبراير شباط Shebat March مارس اذار Adhar April ابريل نيسان Nisan May مايو أيّار Ayyar June يونيو حزيران Ḩazayran July يوليو تمّوز Tammuz August أغسطس اَب ʕAb September سبتمبر أيلول Aylul October أكتوبر تشرين الأول Tishrin Al-Awwal November نوفمبر تشرين الثاني Tishrin Al-Thani December ديسمبر كانون الأول Kanun Al-Awwal Hindu calendar

The Hindu calendar has various systems of naming the months. The months in the lunar calendar are:

Sanskrit name Tamil name Telugu name Nepali name 1 Caitra (चैत्र) Chitirai (சித்திரை) Chaithramu (చైత్రము) Chaitra (चैत्र/चैत) 2 Vaiśākha (वैशाख) Vaikasi (வைகாசி) Vaisaakhamu (వైశాఖము) Baisakh (बैशाख) 3 Jyeṣṭha (ज्येष्ठ) Aani (ஆனி) Jyeshttamu (జ్యేష్ఠము) Jesth (जेष्ठ/जेठ) 4 Ashadha (आषाढ) Aadi (ஆடி) Aashaadhamu (ఆషాఢము) Aasad (आषाढ/असार) 5 Śrāvaṇa (श्रावण) Aavani (ஆவணி) Sraavanamu (శ్రావణము) Srawan (श्रावण/साउन) 6 Bhadrapada (भाद्रपद) Purratasi (புரட்டாசி) Bhaadhrapadamu (భాద్రపదము) Bhadau (भाद्र|भदौ) 7 Āśvina (अश्विन) Aiypasi (ஐப்பசி) Aasveeyujamu (ఆశ్వయుజము) Asoj (आश्विन/असोज) 8 Kārtika (कार्तिक) Kaarthigai (கார்த்திகை) Kaarthikamu (కార్తీకము) Kartik (कार्तिक) 9 Mārgaśīrṣa (मार्गशीर्ष) Maargazhi (மார்கழி) Maargaseershamu (మార్గశిరము) Mangsir (मार्ग/मंसिर) 10 Pauṣa (पौष) Thai (தை) Pushyamu (పుష్యము) Push (पौष/पुष/पूस) 11 Māgha (माघ) Maasi (மாசி) Maaghamu (మాఘము) Magh (माघ) 12 Phālguna (फाल्गुन) Panguni (பங்குனி) Phaalgunamu (ఫాల్గుణము) Falgun (फाल्गुन/फागुन)

These are also the names used in the Indian national calendar for the newly redefined months. Purushottam Maas or Adhik Maas (translit. adhika = 'extra', māsa = 'month') is an extra month in the Hindu calendar that is inserted to keep the lunar and solar calendars aligned. "Purushottam" is an epithet of Vishnu, to whom the month is dedicated.

The names in the solar calendar are just the names of the zodiac sign in which the sun travels. They are

  1. Mesha
  2. Vrishabha
  3. Mithuna
  4. Kataka
  5. Simha
  6. Kanyaa
  7. Tulaa
  8. Vrishcika
  9. Dhanus
  10. Makara
  11. Kumbha
  12. Miina
Bahá'í calendar

The Bahá'í calendar is the calendar used by the Bahá'í Faith. It is a solar calendar with regular years of 365 days, and leap years of 366 days. Years are composed of 19 months of 19 days each (361 days), plus an extra period of "Intercalary Days" (4 in regular and 5 in leap years).[4] The months are named after the attributes of God. Days of the year begin and end at sundown.[4]

Iranian calendar (Persian calendar)

The Iranian / Persian calendar, currently used in Iran and Afghanistan, also has 12 months. The Persian names are included in the parentheses. It begins on the northern Spring equinox.

  1. Farvardin (31 days, فروردین)
  2. Ordibehesht (31 days, اردیبهشت)
  3. Khordad (31 days, خرداد)
  4. Tir (31 days, تیر)
  5. Mordad (31 days, مرداد)
  6. Shahrivar (31 days, شهریور)
  7. Mehr (30 days, مهر)
  8. Aban (30 days, آبان)
  9. Azar (30 days, آذر)
  10. Dey (30 days, دی)
  11. Bahman (30 days, بهمن)
  12. Esfand (29 days- 30 days in leap year, اسفند)
Reformed Bengali calendar

The Bangla calendar, used in Bangladesh, follows solar months and it has six seasons. The months and seasons in the calendar are:

No. Name (Bengali) Name (Sylheti) Name (Rohingya) Season Days Julian months 1 Boishakh (বৈশাখ) Boishakh Boicák Grishmo (গ্রীষ্ম) 31 14 April - May 2 Joishtho (জ্যৈষ্ঠ) Zoit Zeth Grishmo (গ্রীষ্ম) 31 May - June 3 Asharh (আষাঢ়) Aaŗ Acár Borsha (বর্ষা) 31 June - July 4 Shrabon (শ্রাবণ) Haon Cón Borsha (বর্ষা) 31 July - August 5 Bhadro (ভাদ্র) Bhado Bádo Shorot (শরৎ) 31 August - September 6 Aashin (আশ্বিন) Ashin Acín Shorot (শরৎ) 30 September - October 7 Kartik (কার্তিক) Khati Hati Hemonto(হেমন্ত) 30 October - November 8 Ogrohayon (অগ্রহায়ণ) Aghon Óon Hemonto(হেমন্ত) 30 November - December 9 Poush (পৌষ) Phush Fuc Sheet (শীত) 30 December - January 10 Magh (মাঘ) Magh (মাঘ) Mak Sheet (শীত) 30 January - February 11 Falgun (ফাল্গুন) Fagun Fóon Boshonto (বসন্ত) 30 (31 in leap years) February - March 12 Choitro (চৈত্র) Soit Soit Boshonto (বসন্ত) 30 March - April Nanakshahi calendar

The months in the Nanakshahi calendar are:[5]

No. Name Punjabi Days Julian months 1 Chet ਚੇਤ 31 14 March – 13 April 2 Vaisakh ਵੈਸਾਖ 31 14 April – 14 May 3 Jeth ਜੇਠ 31 15 May – 14 June 4 Harh ਹਾੜ 31 15 June – 15 July 5 Sawan ਸਾਵਣ 31 16 July – 15 August 6 Bhadon ਭਾਦੋਂ 30 16 August – 14 September 7 Assu ਅੱਸੂ 30 15 September – 14 October 8 Katak ਕੱਤਕ 30 15 October – 13 November 9 Maghar ਮੱਘਰ 30 14 November – 13 December 10 Poh ਪੋਹ 30 14 December – 12 January 11 Magh ਮਾਘ 30 13 January – 11 February 12 Phagun ਫੱਗਣ 30/31 12 February – 13 March Khmer calendar

Like the Hindu calendar, the Khmer calendar consists of both a lunar calendar and a solar calendar.

The Khmer solar calendar is used more commonly than the lunar calendar. There are 12 months and the numbers of days follow the Julian and Gregorian calendar.

Julian and Gregorian name Khmer name Transliteration Meaning Zodiac sign January មករា Makara មករ "naga" Capricorn February កម្ភៈ Kompeak ក្អម "clay pitcher" Aquarius March មិនា or មីនា Mik Nea or Me Na ត្រី "fish" Pisces April មេសា Mesa ចៀម ពពៃ "ram" Aries May ឧសភា Uk Sak Phea គោឈ្មោល "bull" Taurus June មិថុនា Mik Thok Na គូបុរសនិងស្ត្រី "a pair of boy and girl" Gemini July កក្កដា Kak Ka Da ក្ដាម "crab" Cancer August សីហា Seiha សីហៈ "lion" Leo September កញ្ញា Kagna ស្រីក្រមុំ "girl" Virgo October តុលា Tola ជញ្ជីង "scales" Libra November វិច្ឆិកា Vicheka ខ្ទួយ "scorpion" Scorpio December ធ្នូ Thnu ធ្នូ "bow, arc" Sagittarius

The Khmer lunar calendar contains 12 months; however, the eighth month is repeated (as a "leap-month") every two or three years, making 13 months instead of 12.[6]

  • មិគសិរ
  • បុស្ស
  • មាឃ
  • ផល្គុន
  • ចេត្រ
  • វិសាខ/ ពិសាខ
  • ជេស្ឋ
  • ឤសាឍ, or in the case of a year with a leap-month:
    • បឋមសាឍ
    • ទុតិយាសាឍ
  • ស្រាពណ៍
  • ភទ្របទ
  • អស្សុជ
  • កត្តិក
Thai calendar Main articles: Thai solar calendar and Thai lunar calendar English name Thai name Abbr. Transcription Sanskrit word Zodiac sign January มกราคม ม.ค. mokarakhom mokara "sea-monster" Capricorn February กุมภาพันธ์ ก.พ. kumphaphan kumbha "pitcher, water-pot" Aquarius March มีนาคม มี.ค. minakhom mīna "(a specific kind of) fish" Pisces April เมษายน เม.ย. mesayon meṣa "ram" Aries May พฤษภาคม พ.ค. phruetsaphakhom vṛṣabha "bull" Taurus June มิถุนายน มิ.ย. mithunayon mithuna "a pair" Gemini July กรกฎาคม ก.ค. karakadakhom karkaṭa "crab" Cancer August สิงหาคม ส.ค. singhakhom siṃha "lion" Leo September กันยายน ก.ย. kanyayon kanyā "girl" Virgo October ตุลาคม ต.ค. tulakhom tulā "balance" Libra November พฤศจิกายน พ.ย. phruetsachikayon vṛścika "scorpion" Scorpio December ธันวาคม ธ.ค. thanwakhom dhanu "bow, arc" Sagittarius Tongan calendar

The Tongan calendar is based on the cycles of the moon around the earth in one year. The months are:

  1. Liha Mu'a
  2. Liha Mui
  3. Vai Mu'a
  4. Vai Mui
  5. Faka'afu Mo'ui
  6. Faka'afu Mate
  7. Hilinga Kelekele
  8. Hilinga Mea'a
  9. 'Ao'ao
  10. Fu'ufu'unekinanga
  11. 'Uluenga
  12. Tanumanga
  13. 'O'oamofanongo
Kollam era (Malayalam) calendar Main article: Kollam era Malayalam name Transliteration Concurrent Gregorian months Sanskrit word and meaning Zodiac sign ചിങ്ങം chi-ngnga-m August–September simha "lion" Leo കന്നി ka-nni September–October kanyā "girl" Virgo തുലാം thu-lā-m October–November tulā "balance" Libra വൃശ്ചികം vRSh-chi-ka-m November–December vṛścika "scorpion" Scorpio ധനു dha-nu December–January dhanu "bow, arc" Sagittarius മകരം ma-ka-ra-m January–February mokara "sea-monster" Capricorn കുംഭം kum-bha-m February–March kumbha "pitcher, water-pot" Aquarius മീനം mee-na-m March–April mīna "(a specific kind of) fish" Pisces മേടം mE-Da-m April–May meṣa "ram" Aries ഇടവം i-Ta-va-m May - June vṛṣabha "bull" Taurus മിഥുനം mi-thu-na-m June–July mithuna "a pair" Gemini കർക്കടകം kar-kka-Ta-ka-m July–August karkaṭa "crab" Cancer Sinhalese calendar

The Sinhalese calendar is the Buddhist calendar in Sri Lanka with Sinhala names. Each full moon Poya day marks the start of a Buddhist lunar month.[7] The first month is Vesak.[8]

  1. Duruthu (දුරුතු)
  2. Navam (නවම්)
  3. Mædin (මැදින්)
  4. Bak (බක්)
  5. Vesak (වෙසක්)
  6. Poson (පොසොන්)
  7. Æsala (ඇසල)
  8. Nikini (නිකිණි)
  9. Binara (බිනර)
  10. Vap (වප්)
  11. Il (iL) (ඉල්)
  12. Unduvap (උඳුවප්)
Germanic calendar Main article: Germanic calendar

The old Icelandic calendar is not in official use anymore, but some Icelandic holidays and annual feasts are still calculated from it. It has 12 months, broken down into two groups of six often termed "winter months" and "summer months". The calendar is peculiar in that the months always start on the same weekday rather than on the same date. Hence Þorri always starts on a Friday sometime between January 22 and January 28 (Old style: January 9 to January 15), Góa always starts on a Sunday between February 21 and February 27 (Old style: February 8 to February 14).

  • Skammdegi ("Short days")
  1. Gormánuður (mid October - mid November, "slaughter month" or "Gór's month")
  2. Ýlir (mid November - mid December, "Yule month")
  3. Mörsugur (mid December - mid January, "fat sucking month")
  4. Þorri (mid January - mid February, "frozen snow month")
  5. Góa (mid February - mid March, "Góa's month, see Nór")
  6. Einmánuður (mid March - mid April, "lone" or "single month")
  • Náttleysi ("Nightless days")
  1. Harpa (mid April - mid May, Harpa is a female name, probably a forgotten goddess, first day of Harpa is celebrated as Sumardagurinn fyrsti - first day of summer)
  2. Skerpla (mid May - mid June, another forgotten goddess)
  3. Sólmánuður (mid June - mid July, "sun month")
  4. Heyannir (mid July - mid August, "hay business month")
  5. Tvímánuður (mid August - mid September, "two" or "second month")
  6. Haustmánuður (mid September - mid October, "autumn month")
Old Georgian calendar Main article: Georgian calendar Month Georgian Month Name Transliteration Georgian Other Names Transliteration January აპნისი, აპანი Apnisi, Apani     February სურწყუნისი Surtskunisi განცხადებისთვე Gantskhadebistve March მირკანი Mirkani     April იგრიკა Igrika     May ვარდობისა Vardobisa ვარდობისთვე Vardobistve June მარიალისა Marialisa თიბათვე, ივანობისთვე Tibatve, Ivanobistve July თიბისა Tibisa მკათათვე, კვირიკობისთვე Mkatatve, Kvirikobistve August ქველთობისა Kveltobisa მარიამობისთვე Mariamobistve September ახალწლისა Akhaltslisa ენკენისთვე Enkenistve October სთვლისა Stvlisa ღვინობისთვე Gvinobistve November ტირისკონი Tiriskoni გიორგობისთვე, ჭინკობისთვე Giorgobistve, Chinkobistve December ტირისდენი Tirisdeni ქრისტეშობისთვე Kristeshobistve

*NOTE: New Year in ancient Georgia started from September.

Old Swedish calendar
  1. Torsmånad (January, 'Torre's month' (ancient god))
  2. Göjemånad (February, 'Goe's month' (ancient goddess))
  3. Vårmånad (March, 'Spring month')
  4. Gräsmånad (April, 'Grass month')
  5. Blomstermånad (May, 'Bloom month')
  6. Sommarmånad (June, 'Summer month')
  7. Hömånad (July, 'Hay month')
  8. Skördemånad, Rötmånad (August, 'Harvest month' or 'Rotten month')
  9. Höstmånad (September, 'Autumn month')
  10. Slaktmånad (October, 'Slaughter month')
  11. Vintermånad (November, 'Winter month')
  12. Julmånad (December, 'Christmas month')
Old English calendar

Like the Old Norse calendar, the Anglo-Saxons had their own calendar before they were Christianized which reflected native traditions and deities. These months were attested by Bede in his works On Chronology and The Reckoning of Time written in the 8th century.[9] His months are probably those as written in the Northumbrian dialect of Old English which he was familiar with. The months were so named after the moon; the new moon marking the end of an old month and start of a new month; the full moon occurring in the middle of the month, after which the month was named.

  1. Æfterra-ġēola mōnaþ (January, 'After-Yule month')
  2. Sol-mōnaþ (February, 'Sol month')
  3. Hrēð-mōnaþ (March, 'Hreth month')
  4. Ēostur-mōnaþ (April, 'Ēostur month')
  5. Ðrimilce-mōnaþ (May, 'Three-milkings month')
  6. Ærra-Liþa (June, 'Ere-Litha')
  7. Æftera-Liþa (July, 'After-Litha')
  8. Weōd-mōnaþ (August, 'Weed month')
  9. Hāliġ-mōnaþ or Hærfest-mōnaþ (September, 'Holy month' or 'Harvest month')
  10. Winter-fylleþ (October, 'Winter-filleth')
  11. Blōt-mōnaþ (November, 'Blót month')
  12. Ærra-ġēola mōnaþ (December, 'Ere-Yule')
Old Hungarian calendar

Nagyszombati kalendárium (in Latin: Calendarium Tyrnaviense) from 1579. Historically Hungary used a 12-month calendar that appears to have been zodiacal in nature[10] but eventually came to correspond to the Gregorian months as shown below:[11]

  1. Boldogasszony hava (January, 'month of the happy/blessed lady')
  2. Böjtelő hava (February, 'month of early fasting/Lent' or 'month before fasting/Lent')
  3. Böjtmás hava (March, 'second month of fasting/Lent')
  4. Szent György hava (April, 'Saint George's month')
  5. Pünkösd hava (May, 'Pentecost month')
  6. Szent Iván hava (June, 'Saint John 's month')
  7. Szent Jakab hava (July, 'Saint James' month')
  8. Kisasszony hava (August, 'month of the Virgin')
  9. Szent Mihály hava (September, 'Saint Michael's month')
  10. Mindszent hava (October, 'all saints' month')
  11. Szent András hava (November, 'Saint Andrew's month')
  12. Karácsony hava (December, 'month of Yule/Christmas')
Czech calendar
  1. Leden - derives from 'led' (ice)
  2. Únor - derives from 'nořit' (to dive, referring to the ice sinking into the water due to melting)
  3. Březen - derives from 'bříza' (birch)
  4. Duben - derives from 'dub' (oak)
  5. Květen - derives from 'květ' (flower)
  6. Červen - derives from 'červená' (red - for the color of apples and tomatoes)
  7. Červenec - is the second 'červen' (formerly known as 2nd červen)
  8. Srpen - derives from old Czech word 'sirpsti' (meaning to reflect, referring to the shine on the wheat)
  9. Září - means 'to shine'
  10. Říjen - derives from 'jelení říje', which refers to the estrous cycle of female elk
  11. Listopad - falling leaves
  12. Prosinec - derives from old Czech 'prosiněti', which means to shine through (refers to the sun light shining through the clouds)[12]
Old Egyptian calendar This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. (January 2015) (Learn how and when to remove this template message)

The ancient civil Egyptian calendar had a year that was 365 days long and was divided into 12 months of 30 days each, plus 5 extra days (epagomenes) at the end of the year. The months were divided into 3 "weeks" of ten days each. Because the ancient Egyptian year was almost a quarter of a day shorter than the solar year and stellar events "wandered" through the calendar, it is referred to as Annus Vagus or "Wandering Year".

  1. Thout
  2. Paopi
  3. Hathor
  4. Koiak
  5. Tooba
  6. Emshir
  7. Paremhat
  8. Paremoude
  9. Pashons
  10. Paoni
  11. Epip
  12. Mesori
Nisga'a calendar

The Nisga'a calendar coincides with the Gregorian calendar with each month referring to the type of harvesting that is done during the month.[citation needed]

  1. K'aliiyee = Going North - referring to the Sun returning to its usual place in the sky
  2. Buxwlaks = Needles Blowing About - February is usually a very windy month in the Nass River Valley
  3. Xsaak = To Eat Oolichans - Oolichans are harvested during this month
  4. Mmaal = Canoes - The river has defrosted, hence canoes are used once more
  5. Yansa'alt = Leaves are Blooming - Warm weather has arrived and leaves on the trees begin to bloom
  6. Miso'o = Sockeye - majority of Sockeye Salmon runs begin this month
  7. Maa'y = Berries - berry picking season
  8. Wii Hoon = Great Salmon - referring to the abundance of Salmon that are now running
  9. Genuugwwikw = Trail of the Marmot - Marmots, Ermines and animals as such are hunted
  10. Xlaaxw = To Eat Trout - trout are mostly eaten this time of year
  11. Gwilatkw = To Blanket - The earth is "blanketed" with snow
  12. Luut'aa = Sit In - the Sun "sits" in one spot for a period of time
French Republican calendar Main article: French Republican calendar

This calendar was proposed during the French Revolution, and used by the French government for about twelve years from late 1793. There were twelve months of 30 days each, grouped into three ten-day weeks called décades. The five or six extra days needed to approximate the tropical year were placed after the months at the end of each year. A period of four years ending on a leap day was to be called a Franciade. It began at the autumn equinox:

  • Autumn:
  1. Vendémiaire
  2. Brumaire
  3. Frimaire
  • Winter:
  1. Nivôse
  2. Pluviôse
  3. Ventôse
  • Spring:
  1. Germinal
  2. Floréal
  3. Prairial
  • Summer:
  1. Messidor
  2. Thermidor
  3. Fructidor
Eastern Ojibwe calendar

Ojibwe month names are based on the key feature of the month. Consequently, months between various regions have different names based on the key feature of each month in their particular region. In the Eastern Ojibwe, this can be seen in when the sucker makes its run, which allows the Ojibwe to fish for them. Additionally, in the Eastern Ojibwa-Chippewa-Ottawa Dictionary, Dr. Richard Rhodes also informs of not only the variability in the month names but how in the Eastern Ojibwe, these names were originally applied to the lunar months the Ojibwe originally used, which was a lunisolar calendar marked by the moon, fixed to Akiinaaniwan (typically December 27) that marks when sunrise is the latest in the Northern Hemisphere. Due to Eastern Ojibwe is a vowel syncope dialect, the elided vowels (and the occasionally elided consonants) have been added back in the table below, shown in brackets.

Month Month in Eastern Ojibwe Translation Originally the month of the Ojibwa year Starting at the first full moon after: January
in those places that do not have a sucker run during that time shki-bboon-giisoons Little New-winter moon 13 (leap month) used if there is a new moon after gchi-bboon-giizis before December 27. January
in those places that have a sucker run during that time nmebin-giizis Sucker moon 1 December 27 nmebni-giizis February naabni-giizis Crust-on-the-snow moon 2 January 25 March ziizbaakdoke-giizis Sugaring moon 3 February 26 April
in those places that have a sucker run during that time nmebin-giizis Sucker moon 4 March 25 nmebni-giizis April
in those places that do not have a sucker run during that time waawaasgone-giizis Flower moon May
in those places that have a April sucker run May
in those places that have a January sucker run gtige-giizis Planting moon 5 April 24 June
in those places that have a April sucker run June
in those places that have a January sucker run dehmin-giizis Strawberry moon 6 May 23 July miin-giizis Blueberry moon 7 June 22 August datgaagmin-giizis Blackberry moon 8 July 20 September mdaamin-giizis Corn moon 9 August 18 October bnaakwe-giizis Leaves-fall moon 10 September 17 bnaakwii-giizis Harvest moon November gshkadin-giizis Freeze-up moon 11 October 16 December gchi-bboon-giizis Big-winter moon 12 November 15 Adhik Maas

Purushottam Maas or Adhik Maas is an extra month in the Hindu calendar that is inserted to keep the lunar and solar calendars aligned. "Purushottam" is an epithet of Vishnu, to whom the month is dedicated.[13]

See also Look up month in Wiktionary, the free dictionary.
  • Maya calendar
  • Chinese calendar
  • Egyptian calendar
  • Ethiopian calendar
  • Lunar month
  • Kurdish calendar
References
  1. ^ Solomon, Stenson (2009). Pingelap Non-Sacred Knowledge. Historic Preservation Fund Grant Department of Land and Natural Resources..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/12px-Wikisource-logo.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-maint{display:none;color:#33aa33;margin-left:0.3em}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
  2. ^ "Days in each Month". Mnemonics to Improve Memory. EUdesign. 1997. Retrieved 8 August 2018.
  3. ^ The Boy Mechanic: A Handy Calendar. Project Gutenberg. 1. 1913 – via Full Books.
  4. ^ a b Esslemont, J. E. (1980). Bahá'u'lláh and the New Era (5th ed.). Wilmette, Illinois, USA: Bahá'í Publishing Trust. pp. 178–179. ISBN 0-87743-160-4.
  5. ^ "What is the Sikh Nanakshahi calendar". All About Sikhs. Gateway to Sikhism. 2007. Archived from the original on 10 May 2008. Retrieved 9 May 2008.
  6. ^ "Khmer Chhankitek Calendar". Cambodian Coordinating Council. Retrieved 8 August 2018.
  7. ^ "Sri Lanka – Festival Calendar". Premlanka Hotel. Curlew Communications Ltd. Retrieved 8 August 2018.
  8. ^ "The Significance of Poya". Lanka Library. Retrieved 8 August 2018.
  9. ^ Newton, Dr Sam (2000). "The Old English Calendar". Wuffings. Retrieved 8 August 2018.
  10. ^ Bodroghy, Gabor Z. (1998). "The Calendar by Marsigli: the ancient Hungarian Calendar". The Ancient Hungarian Rovas. Archived from the original on 29 September 2007. Retrieved 8 August 2018.
  11. ^ "Hónapok nevei". Free Web (in Hungarian). Archived from the original on 27 February 2008. Retrieved 8 August 2018.
  12. ^ KEBRLE, Vojtěch. Česká jména měsíců, jejich význam a původ, Naše řeč 23, 1939
  13. ^ Shukla, Ritu (24 January 2017). "12 important facts about Adhik Mass you must know!". Astro Speak. Archived from the original on 29 March 2018. Retrieved 8 August 2018.
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