Lunation Number
Encyclopedia
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.
The most commonly used is the Brown
Lunation Number, 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.
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 Islamic Lunation Number is the count of lunations since the beginning of the Islamic Calendar
on July 16, 622. It can be calculated using ILN = 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, 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 since the beginning of the Hebrew Calendar
on September 7, 3761 BC. It can be calculated using HLN = LN + 71234.
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.
Lunation
Lunation is the mean time for one lunar phase cycle . It is on average 29.530589 days, or 29 days 12 hours 44 minutes and 3 seconds...
beginning from a certain one in history. There are several series of lunation numbers in use.
The most commonly used is the Brown
Ernest William Brown
Ernest William Brown FRS was a British mathematician and astronomer, who spent the majority of his career working in the United States....
Lunation Number, which defines lunation 1 as beginning at the first new moon of 1923, the year when Ernest William Brown's
Ernest William Brown
Ernest William Brown FRS was a British mathematician and astronomer, who spent the majority of his career working in the United States....
lunar theory was introduced in the major national astronomical almanacs. Lunation 1 occurred at approximately 02:41 UTC, January 17, 1923.
Another increasingly popular lunation number (simply called the Lunation Number), introduced by Jean Meeus
Jean Meeus
Jean Meeus is a Belgian astronomer specializing in celestial mechanics. The asteroid 2213 Meeus is named after him.Jean Meeus studied mathematics at the University of Leuven in Belgium, where he received the Degree of Licentiate in 1953...
, 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 Islamic Lunation Number is the count of lunations since the beginning of the Islamic Calendar
Islamic calendar
The Hijri calendar , also known as the Muslim calendar or Islamic calendar , is a lunar calendar consisting of 12 lunar months in a year of 354 or 355 days. It is used to date events in many Muslim countries , and used by Muslims everywhere to determine the proper day on which to celebrate Islamic...
on July 16, 622. It can be calculated using ILN = 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, 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 since the beginning of the Hebrew Calendar
Hebrew calendar
The Hebrew calendar , or Jewish calendar, is a lunisolar calendar used today predominantly for Jewish religious observances. It determines the dates for Jewish holidays and the appropriate public reading of Torah portions, yahrzeits , and daily Psalm reading, among many ceremonial uses...
on September 7, 3761 BC. It can be calculated using HLN = LN + 71234.
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.