Getting My Calendar Geek On

[gnomi]

OK, so today is 29 February, AKA Leap Day. It is also a Jewish leap year, meaning that we have a second iteration of the month of Adar. We happen to be in the leap month, Adar I, right now. Today is 23 Adar I.

So I was first wondering how often a Jewish leap year and a Gregorian leap year fall out together. I started looking back (using Tamar) and discovered that not only did 29 February 2000 fall out in Adar I, it fell out on 23 Adar I.

Further research shows that a year with an Adar I and a 29 February appear to occur every eight years. 29 February 1992 was 25 Adar I.

What this means, I do not know. I just think it's cool.

Comments

[caryabend.livejournal.com]

IIRC, the Jewish calendar works on a 7 leaps in a 19 year cycle, with Adarot (I feel that months should be female, somehow) "occurring on the 3rd, 6th, 8th, 11th, 14th, 17th and 19th years of the cycle" (http://www.jewfaq.org/calendar.htm).

1968 was NOT a Jewish leap year, but you can see that there are many 8-year spans. The following 56 (7x8) year run occurs: 17-6-14-3-11-19-8, corresponding to 1976, '84, '92, 2000, '08, '16, and '24. 2032 will not be a Jewish leap year either. The cycle repeats in 2128, or 152 (19x8) years.

I might have had work to do today, but clearly not.

[mabfan.livejournal.com]

I was born in an Adar I.

[cellio]

I noticed recently that this year our wedding anniversary lines up on the Hebrew and secular dates. I think that's the first time that's happened (this will be eight years). I wonder (but haven't researched) what it would take to get the trifecta of Hebrew date, secular date, and original day of week.

[caryabend.livejournal.com]

No more than 689,472 years. (The full Hebrew Calendar Cycle - http://www.geocities.com/Athens/1584/)

[autotruezone.livejournal.com]

Gnomi, you forgot to wish Fredrick a happy 37th birthday!

[gnomi.livejournal.com]

I only wish happy birthday to people who are my mutual friends. Fredric has never friended me back. :-)

[vettecat.livejournal.com]

I meant to look that up and post about it Thursday night but I was too exhausted, and then I forgot... thanks for doing the research!