Editing New moon (section)

==Lunation number== <!-- Note that as this article covers the religious beliefs of many different cultures, it is better to use the neutral CE/BCE notation than the explicitly Christian AD/BC notation -->
{{more citations needed section|date=May 2015}}
The ''Lunation Number'' or ''Lunation Cycle'' is a number given to each [[wiktionary: lunation|lunation]] beginning from a specific one in history. Several conventions are in use.

The most commonly used was the [[Ernest William Brown|Brown]] Lunation Number (BLN), which defines "lunation 1" as beginning at the first new moon of 1923, the year when [[Ernest William Brown|Ernest William Brown's]] [[lunar theory]] was introduced in the [[American Ephemeris and Nautical Almanac]]. {{citation needed|date=April 2021}} Lunation 1 occurred at approximately 02:41 [[UTC]], 17 January 1923. With later refinements, the BLN was used in almanacs until 1983.<ref>{{Cite web |last1=Chapront-Touzé |first1=M |last2=Chapront |first2=J |year=2002 |title=Analytical Ephemerides of the Moon in the 20th Century |url=ftp://cyrano-se.obspm.fr/pub/6_documents/3_notes/lu20thcy.pdf |publisher=[[Observatoire de Paris]] |pages=21–22 }}</ref>

A more recent lunation number{{snd}} called the Lunation Number (LN){{efn|{{sic}}, not MLN}}{{snd}} was introduced by [[Jean Meeus]] in 1998,<ref>{{Cite book |last=Meeus |first=Jean |title=Astronomical algorithms |year=1998 |isbn=9780943396613 |edition=2nd |location=Richmond, Va. |oclc=40521322 |author-link=Jean Meeus |publisher=Willmann-Bell}}</ref> and defines lunation 0 as beginning on the first new moon of 2000 (this occurred at approximately 18:14 [[UTC]], 6 January 2000).  The formula relating Meeus's Lunation Number to the Brown Lunation Number is BLN = LN + 953.

The Goldstine Lunation Number (GLN) refers to the lunation numbering used by [[Herman Goldstine]],<ref>{{Cite book |last=Goldstine |first=Herman |title=New and Full Moons: 1001 B.C. to A.D. 1651 |publisher=American Philosophical Society |year=1973 |isbn=9780871690944 |location=Philadelphia |oclc=609368 |author-link=Herman Goldstine}}</ref> with lunation 0 beginning on 11 January 1001 BCE, and can be calculated using GLN = LN + 37105.

The Hebrew Lunation Number (HLN) is the count of lunations in the [[Hebrew calendar]] with lunation 1 beginning on 6 October 3761 BCE.<ref>{{Cite web|title=Hebrew Calendar Calculator|url=https://webspace.science.uu.nl/~gent0113/hebrew/hebrewyear_year.htm|access-date=2023-02-07|website=webspace.science.uu.nl}}</ref> It can be calculated using HLN = LN + 71234.

The Islamic Lunation Number (ILN) is the count of lunations in the [[Islamic Calendar]] with lunation 1 as beginning on the first day of the month of [[Muharram]], which occurred in 622&nbsp; CE (15 July, Julian, in the proleptic reckoning).<ref>{{Cite journal|last=Ilyas|first=M.|date=1991-06-01|title=Hijrah Day Number, Islamic Day Number and Islamic Lunation Number: New parameters for exacting the Islamic calendar|url=https://ui.adsabs.harvard.edu/abs/1991JBAA..101..175I|journal=Journal of the British Astronomical Association|volume=101|pages=175–176|bibcode=1991JBAA..101..175I |issn=0007-0297}}</ref>  It can be calculated using ILN = LN + 17038.

The Thai Lunation Number (TLN) is called "มาสเกณฑ์" (Maasa-Kendha), defines lunation 0 as the beginning of [[Burmese era]] of the [[Buddhist calendar]] on Sunday, 22 March 638 CE.{{citation needed|date=April 2021}}  It can be calculated using TLN = LN + 16843.