# New moon | lunation number

## Lunation Number

The Lunation Number or Lunation Cycle is a number given to each lunation beginning from a certain one in history. Several conventions are in use.[14]

The most commonly used is the Brown Lunation Number (BLN), which defines lunation 1 as beginning at the first new moon of 1923, the year when Ernest William Brown's lunar theory was introduced in the major national astronomical almanacs. Lunation 1 occurred at approximately 02:41 UTC, January 17, 1923. New moons occur on Julian Dates ${\displaystyle 2449128.59+29.53058867*(\mathrm {BLN} -871)\pm 0.25}$, with the given uncertainty due to varying torques from the sun.

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 occurred at approximately 18:14 UTC, January 6, 2000). The formula relating this Lunation Number with the Brown Lunation Number is: BLN = LN + 953.

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, with lunation 0 beginning on January 11, 1001 BC, and can be calculated using GLN = LN + 37105.

The Hebrew Lunation Number is the count of lunations in the Hebrew calendar with lunation 1 beginning on October 7, 3761 BC. It can be calculated using HLN = LN + 71234. The Islamic Lunation Number is the count of lunations in the Islamic calendar with lunation 1 as beginning on July 16, 622. It can be calculated using ILN = LN + 17038. The Thai Lunation Number is called "มาสเกณฑ์" (Maasa-Kendha), defines lunation 0 as beginning of the SouthEast-Asian Calendar on Sunday March 22, 638 (Julian Calendar). It can be calculated using TLN = LN + 16843.

Other Languages
العربية: محاق
বাংলা: অমাবস্যা
беларуская: Маладзік
български: Новолуние
català: Lluna nova
čeština: Nov
dansk: Nymåne
Deutsch: Neumond
español: Luna nueva
Esperanto: Novluno
estremeñu: Novicionis
فارسی: ماه نو
français: Nouvelle lune
Frysk: Nijmoanne
한국어: 신월
հայերեն: Նորալուսին
Bahasa Indonesia: Bulan baru
italiano: Novilunio
kaszëbsczi: Nów
Kiswahili: Mwezi mwandamo
Lëtzebuergesch: Neimound
lietuvių: Jaunatis
македонски: Млада месечина
മലയാളം: അമാവാസി
Bahasa Melayu: Anak bulan
Nederlands: Nieuwe maan
नेपाली: औंसी

Nordfriisk: Neimuun
norsk: Nymåne
norsk nynorsk: Lunasjon
occitan: Luna novèla
oʻzbekcha/ўзбекча: Yangi oy
Plattdüütsch: Neemaand
polski: Nów
português: Lua nova
Ripoarisch: Neumond
română: Lună nouă
Runa Simi: Killa wañuy
русский: Новолуние
Scots: New muin
slovenčina: Nov (fáza Mesiaca)
suomi: Uusikuu
svenska: Nymåne
Tagalog: Bagong buwan
Türkçe: Yeni ay
українська: Новий Місяць
walon: Tinre lune