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The Nisan Descent
The Nisan Descent

by Remy Landau
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Whenever the first day of the month of Nisan coincides with any day past the 5th day of March, but in the Month of March, then the first day of each subsequent Hebrew month, until the end of the Hebrew year, coincides with its corresponding Gregorian day in a descending sequence. The sequence is an arithmetical progression in which the difference between each term is -1.

The descending sequence of the corresponding Gregorian days will be referred to as the Nisan descent.

The First Nisan Descent

The following table for the year 3H shows the first occurrence of the Nisan descent.

The Moladot For 3H
Month Moment of Molad First Day Chodesh
Tishrei
Tue 22h 48m 12hl
  Thu 18 Aug -3758g 
Heshvan
Thu 11h 32m 13hl
 *Sat 17 Sep -3758g 
Kislev
Sat  0h 16m 14hl
  Sun 16 Oct -3758g 
Tevet
Sun 13h  0m 15hl
  Mon 14 Nov -3758g 
Shevat
Tue  1h 44m 16hl
  Tue 13 Dec -3758g 
Adar
Wed 14h 28m 17hl
 *Thu 12 Jan -3757g 
v'Adar
Fri  3h 13m  0hl
 *Sat 11 Feb -3757g 
Nisan
Sat 15h 57m  1hl
  Sun 12 Mar -3757g 
Iyar
Mon  4h 41m  2hl
 *Tue 11 Apr -3757g 
Sivan
Tue 17h 25m  3hl
  Wed 10 May -3757g 
Tammuz
Thu  6h  9m  4hl
 *Fri  9 Jun -3757g 
Av
Fri 18h 53m  5hl
  Sat  8 Jul -3757g 
Elul
Sun  7h 37m  6hl
 *Mon  7 Aug -3757g 

The Earliest Possible Nisan Descent

The earliest possible Nisan descent is formed when the first day of Nisan coincides with the 6th day of March. That first happened for 1 Nisan 9H, corresponding to 6 March -3751g. It last happened in 4424H, corresponding to 664g, and will not reoccur until March 6, 81993H (78234g). The following table shows the moladot for 9H.

The Moladot For 9H
Month Moment of Molad First Day Chodesh
Tishrei
Fri 17h 52m 15hl
  Sat  9 Sep -3752g 
Heshvan
Sun  6h 36m 16hl
 *Mon  9 Oct -3752g 
Kislev
Mon 19h 20m 17hl
 *Wed  8 Nov -3752g 
Tevet
Wed  8h  5m  0hl
 *Fri  8 Dec -3752g 
Shevat
Thu 20h 49m  1hl
  Sat  6 Jan -3751g 
Adar
Sat  9h 33m  2hl
 *Mon  5 Feb -3751g 
Nisan
Sun 22h 17m  3hl
  Tue  6 Mar -3751g 
Iyar
Tue 11h  1m  4hl
 *Thu  5 Apr -3751g 
Sivan
Wed 23h 45m  5hl
  Fri  4 May -3751g 
Tammuz
Fri 12h 29m  6hl
 *Sun  3 Jun -3751g 
Av
Sun  1h 13m  7hl
  Mon  2 Jul -3751g 
Elul
Mon 13h 57m  8hl
 *Wed  1 Aug -3751g 

The Last Nisan Descent

The last time, before Thursday March 6, 81993H (78234g), that the first day of Nisan will coincide with any day in the month of March will be in the year 10257H (6497g). The following table shows the first day of Nisan coinciding with the last day of March.

The Moladot For 10257H
Month Moment of Molad First Day Chodesh
Tishrei
Fri  1h 58m 10hl
  Sat  6 Oct  6496g 
Heshvan
Sat 14h 42m 11hl
 *Mon  5 Nov  6496g 
Kislev
Mon  3h 26m 12hl
  Tue  4 Dec  6496g 
Tevet
Tue 16h 10m 13hl
  Wed  2 Jan  6497g 
Shevat
Thu  4h 54m 14hl
  Thu 31 Jan  6497g 
Adar
Fri 17h 38m 15hl
 *Sat  2 Mar  6497g 
Nisan
Sun  6h 22m 16hl
  Sun 31 Mar  6497g 
Iyar
Mon 19h  6m 17hl
 *Tue 30 Apr  6497g 
Sivan
Wed  7h 51m  0hl
  Wed 29 May  6497g 
Tammuz
Thu 20h 35m  1hl
 *Fri 28 Jun  6497g 
Av
Sat  9h 19m  2hl
  Sat 27 Jul  6497g 
Elul
Sun 22h  3m  3hl
 *Mon 26 Aug  6497g 

Two Consecutive Nisan Descents

The following shows the Nisan descents for two consecutive years, which interestingly enough, are close to our own times.

The Moladot For 5758H
Month Moment of Molad First Day Chodesh
Tishrei
Thu  4h  7m  3hl
  Thu  2 Oct  1997g 
Heshvan
Fri 16h 51m  4hl
 *Sat  1 Nov  1997g 
Kislev
Sun  5h 35m  5hl
  Sun 30 Nov  1997g 
Tevet
Mon 18h 19m  6hl
 *Tue 30 Dec  1997g 
Shevat
Wed  7h  3m  7hl
  Wed 28 Jan  1998g 
Adar
Thu 19h 47m  8hl
 *Fri 27 Feb  1998g 
Nisan
Sat  8h 31m  9hl
  Sat 28 Mar  1998g 
Iyar
Sun 21h 15m 10hl
 *Mon 27 Apr  1998g 
Sivan
Tue  9h 59m 11hl
  Tue 26 May  1998g 
Tammuz
Wed 22h 43m 12hl
 *Thu 25 Jun  1998g 
Av
Fri 11h 27m 13hl
  Fri 24 Jul  1998g 
Elul
Sun  0h 11m 14hl
 *Sun 23 Aug  1998g 

The Moladot For 5759H
Month Moment of Molad First Day Chodesh
Tishrei
Mon 12h 55m 15hl
  Mon 21 Sep  1998g 
Heshvan
Wed  1h 39m 16hl
 *Wed 21 Oct  1998g 
Kislev
Thu 14h 23m 17hl
 *Fri 20 Nov  1998g 
Tevet
Sat  3h  8m  0hl
 *Sun 20 Dec  1998g 
Shevat
Sun 15h 52m  1hl
  Mon 18 Jan  1999g 
Adar
Tue  4h 36m  2hl
 *Wed 17 Feb  1999g 
Nisan
Wed 17h 20m  3hl
  Thu 18 Mar  1999g 
Iyar
Fri  6h  4m  4hl
 *Sat 17 Apr  1999g 
Sivan
Sat 18h 48m  5hl
  Sun 16 May  1999g 
Tammuz
Mon  7h 32m  6hl
 *Tue 15 Jun  1999g 
Av
Tue 20h 16m  7hl
  Wed 14 Jul  1999g 
Elul
Thu  9h  0m  8hl
 *Fri 13 Aug  1999g 

Understanding The Nisan Descent

The Nisan descent is easily explained once it is understood that the 5 Hebrew months from Nisan through Av alternate regularly between 30 and 29 days, while the 5 Gregorian months from March through July alternate regularly between 31 and 30 days.


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Remy Landau

First  Paged 25 May 1998
Next Revised  2 Jun 1998