As many of us have already noticed, this year, Thanksgiving occurs on the first day of Chanukah. This rare event has caused much discussion and interest in the calendar. Although many of us remember Chanukah beginning during the weekend of Thanksgiving (e.g., in 1975 and 2002, Chanukah began on Friday night, the day after Thanksgiving), no one seems to remember a time when Chanukah and Thanksgiving actually coincided.

Why is this occurrence so infrequent? Chanukah usually falls in the civil calendar during the month of December. In “early years,” it begins in late November, and in “late years” it ends in early January. This year, the first day of Chanukah is on November 28th. This is an extremely early day in the solar calendar. In the 20th century, this only happened once, in 1994, when Chanukah began on Monday, November 28th. Thanksgiving that year was on the previous Thursday (see below what was special about that Chnaukah).