December 25th, 2005

physics

Christmas and Chanukkah on same day

After Christmas dinner today at fj and pinkfish's, someone was wondering how frequently does the first night of Chanukkah fall on Christmas day. I surmised that if it were on the nth day of a certain month and that since there were either 12 or 13 months in a year it would be approximately every 60 years. This would be a good reason for most people not remembering a prior occurance.

And sure enough, a quick web check about Jewish calendars showed that Channukah falls on the 25th of Kislev, the 9th month.