Babylonian Calendar - Months

Months

The year begins in spring, and is divided into reš šatti "beginning", mišil šatti "middle", and kīt šatti "end of the year". The name for "month" was arḫu (status constructus araḫ). That the calendar originates in Babylonian, not Assyrian times is shown by the fact that the chief deity of the Assyrians is assigned the surplus intercalary month. During the 6th century BC Babylonian exile of the Hebrews, the Babylonian month names were adopted into the Hebrew calendar. The Aramaic calendar used in Iraq and the Levant also uses many of the same names for its months, such as Iyyar, Tammuz, Ab, Elul, Tishri, and Adar.

Babylonian calendar
Season Month name Presiding deities Zodiac sign Equivalent in Hebrew calendar Equivalent in Gregorian calendar
Reš Šatti 1 Araḫ Nisānu

'Month of the Sanctuary'

Anu and Bel KU (Aries) Nisan March/April
2 Araḫ Āru

'Month of the Bull'

Ea Iyar April/May
3 Araḫ Simanu Sin BI(KAŠ) (Gemini) Sivan May/June
4 Araḫ Dumuzu

'Month of Tammuz'

Tammuz Tammuz June/July
Mišil Šatti 5 Araḫ Abu āru (Leo) Av July/August
6 Araḫ Ulūlu Ishtar (Virgo) Elul August/September
7 Araḫ Tišritum

'Month of Beginning' (i.e. the start of the 2nd half-year)

Shamash (Libra) Tishrei September/October
8 Araḫ Samna

'Month of Laying Foundations'

Marduk (Scorpio) Cheshvan October/November
Kīt Šatti 9 Araḫ Kislimu Nergal (Sagittarius) Kislev November/December
10 Araḫ Ṭebētum

'Month of the Forthcoming of Water'

Pap-sukkal saḫ 'ibex' (Capricorn?)

Tevet

December/January
11 Araḫ Šabaṭu qā (Aquarius?) Shevat January/February
12 Araḫ Addaru ~ Araḫ Adār

'Month of Adar'

Erra (Pisces) Adar February/March
Intercalary 13 Araḫ Makaruša Addari ~ Araḫ Ve-Adār Ashur Except in year 17 of 19-year cycle, when intercalary month was after Araḫ Ulūlu.

Until the 5th century BC the calendar was fully observational, but beginning about 499 BC the months began to be regulated by a lunisolar cycle of 19 years equaling 235 months. Although usually called the Metonic cycle, Meton (432 BC) probably learned of the cycle from the Babylonians. After no more than three isolated exceptions, by 380 BC the months of the calendar were regulated by the cycle without exception. In the cycle of 19 years, the month Adaru 2 was intercalated, except in the year that was number 17 in the cycle, when the month Ululu 2 was inserted. During this period, the first day of each month (beginning at sunset) continued to be the day when a new crescent moon was first sighted—the calendar never used a specified number of days in any month.

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