Lunation Number

Lunation Number

Lunation Number is a number given to each lunation beginning from a certain one in history. There are several series of lunation numbers in use.

Perhaps the most commonly used is the Brown Lunation Number, which defines lunation 1 as beginning at the first new moon of 1923 (this occured at approximately 02:41 UTC, January 17, 1923).

Another increasingly popular lunation number (simply called the Lunation Number), introduced by Jean Meeus, defines lunation 0 as beginning on the first new moon of 2000 (this occured at approximately 18:14 UTC, January 6, 2000). The formula relating this Lunation Number with the Brown Lunation Number is: BLN = LN + 953

The Islamic Lunation Number is the count of lunations since the beginning of the Islamic Calendar on July 16, 622. It can be calculated using ILM = LN + 17038

The Goldstine Lunation Number refers to the lunation numbering used by Herman Goldstine in his 1973 book "New and Full Moons: 1001 B.C. to A.D. 1651", and can be calculated using GLN = LN + 37105.

External links

* [http://www.astrostar.com/MoonPhases.htm Table of recent and upcoming lunation numbers]
* [http://scienceworld.wolfram.com/astronomy/Lunation.html Lunation number in ScienceWorld]


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