The Jewish "leap year", which occurs seven times in a 19year cycle, has 13 months instead of the regular year's 12. This is so that the lunarbased Jewish year should remain aligned with the solar seasons (12 lunar months make up a total of 354 days — slightly more than 11 days short of the 365.25 day solar cycle). The added month is called "Adar I" and is inserted before the month of Adar (termed "Adar II" in leap years).
The Jewish Leap Year
Leap Year Explained Adar: the month especially "pregnant" with meaning.


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Is there a formula to calculate and find out when it is leap year ?
Every 19 years, there are 7 leap years.
To determine whether a Jewish year is a leap year, you must find its position in the 19year Metonic cycle. This position is calculated by dividing the Jewish year number by 19 and finding the remainder. (Since there is no year 0, a remainder of 0 indicates that the year is year 19 of the cycle.) For example, the Jewish year 5779 divided by 19 results in a remainder of 3, indicating that it is year 3 of the Metonic cycle.
The 3rd, 6th, 8th, 11th, 14th, 17th, and 19th years of the 19year Metonic cycle are leap years.
My Calculator say 5779 ÷ by 19 = 304.15789 where is the remainder of 3 ...
5780 ÷ by 19 = 304.21052 ..
5781 ÷ by 19 = 304.26315 ...
5782 ÷ by 19 = 304.31578 (leap year?)
5783 ÷ by 19 = 304.36842 (leap year?)
How are these calculations meant to be done?????? There obviously is a different calculation process to get this right.
Steps with a calculator:
5780/19 = 304.21052...
304.21052... — 304 = 0.21052...
0.21052... X 19 = 4.
Your calculator might show 3.9999... or something slightly larger than 4 when finished; calculators have finite precision. You can also use long division on paper to get the remainder.
Thank you. I have decided to use the simply long division method, as would have been done before calculators were used.
Re: jewish birthday
It's always good to feel young, regardless of how many years actually passed since your birth.
If you were born in a leap year, then in a nonleap year your Jewish birthday is celebrated in regular Adar.
jewish birthday
if born on a leap year, feb 6th 1957(apparently my birthday would be 5th adar 1 5717.) how many leap years since my birth date? How 'old' would i be?
my kids and I laugh that I'd be 19 but how old would I actually be?
Nobody has been able to help me, so I'd really appreciate it.
thanks
Dear Reb Yid, Your birthday is in Adar I of Shanah 5717. Your birthday will occur in all years after, on Chodesh Adar I (even leap years). So your age is still 61, not 23. Even if we counted only leap years, and you were born in Chodesh Adar II, for you to be only 19, your actual age would be 48 at present (Chodesh Kislev 5779). If my calculations are correct(?) you were born in the 6th year of our 19 year Luach cycle. Not to worry, this leap year thing is confusing. Imagine if you were born on the 28th of Chodesh Adar I, and your younger friend, was born on the 7th of Chodesh Adar II, that same year. If your year of Bar Mitzvah was a standard year, you’d have your Bar Mitzvah after your younger friend. Anyone with a birthdate in Chodesh Adar II, we transpose their birthdate to Chodesh Adar I, for standard years. It is a fascinating feature of our calendar system. Hoping this helps resolve your quandary. It is a good question. Wishing you continued success, b’simcha ad 120. J Rocklin
Leap Year: when is the "leap month" reduced How do you calculate the reducing of the "leap month" when it goes above 18/19? Does it fall in February or March of the Gregorian calendar?
Re: Adar 25 I think that in general, unless otherwise specified it is assumed that it occurred in a regular nonleap year or in the second Adar.
Adar 25
I am researching some historical facts about Babylonian king of Nebuchadnezzar. I read an article that he died on Adar 25. I am not familiar on the Jewish calendar. This year there are two Adar months. So in which Adar month, I or II, do I have to consider for the date of the death of the Nebuchadnezzar? March 5(25 Adar I) or April 4 (25 Adar II)?
Thank you for your reply beforehand.
when was the last leap year?
Re: There are many different interpretations given for this idea, and it is used as a reference for various different ideas. One of the simplest interpretations is that each of the six days of creation correspond to one millennium; the first day to the first millennium the second to the second etc.Being that we are currently in the sixth millennium, our times correspond to the sixth day of creation. The closer we get to the end of the millennium, the closer we approach the day of Shabbat, which will result in eternal rest with the era of Moshiach.
Please explain one day is a thousand years and where are we.
Re Shemitah No, it was not a shemitah year. We are currently in a shemitah year now. The last one prior to that was 20085768
If a leap year comes every 2 to 3 years how could the last one be in 2008?
5771 a leap year? was 5771 a leap year?
To Anonymous The year 5745 was not a leap year.
Question : Was the year 5745 ( Tav Shin Mem Heh ) a leap year ?
Leap years
Years 3, 6, 8, etc. you said. But of what calendar year? Gregorian (C.E.), or rabbinic Hebrew (A.M.), or Scriptural year?
Calculation
To determine whether a Jewish year is a leap year, one must find its position in the 19year Metonic cycle. This position is calculated by dividing the Jewish year number by 19 and finding the remainder. For example, Jewish year 5771 divided by 19 results in a remainder of 14, indicating that it is year 14 of the Metonic cycle. Since there is no year 0, a remainder of 0 indicates that the year is year 19 of the cycle. (See also Golden number (time).)
Years 3, 6, 8, 11, 14, 17, and 19 the Metonic cycle are leap years.
How did you come up with a remainder of 14. I divided 5771 by 19 and came up with a quotient of 303.73684 so how do I get to 14 from there?
As I type this we are in the Jewish year of 5777. So dividing by 19 I get 304.05263. I trying to find out when the next Jewish leap year will occur but no site I've visited as any indication of that.
Remember grade school math?..
19 goes into 5771 303 times with remainder of 14 (303x19=5757)
calendar calculation algorithms I am a software engineer/ mathematician and I was wondering if there are algorithms to calculate the calendar accurately. I have tried to follow all the evolution of the calendar during the centuries, it is very interesting but it appears to me that there is always some human decision in the definition of the calendar even today. Pardon my ignorance on the subject, my interest is purely mathematical algorithmic. Can someone give me some references or directions about it. Any help will be highly appreciated. Thank You,
Biblical support for leap year? Greetings. Is there biblical support for the Hebrew calendar's leap year and, if so, where can it be found?
Passover is referred to as Chag HaAviv  the spring festival as it occurs in the Chodesh HaAviv  Spring Month. See Ex 13:4, Ex 23:14 and Dt 16:1. In order that Passover that celebrates the going out of Egypt falls in the spring or the Spring Month falls in spring then it requires the extra month every so often. Also, Succot is called the ingathering festival when all the grains are removed from the fields and gathered into the barn before the rains fall. This festival also must fall at the correct time of the year to celebrate this.