Christmas and Hanukkah both always fall on the 25th, but of two different months, with Christmas coming on the 25th of December on the Gregorian calendar, and Hanukkah starting on the 25th day of the ...
The simple answer is that the Jewish calendar is based on lunar cycles, and is not in sync with the Gregorian calendar which sets Christmas on Dec. 25. Hanukkah always begins on the 25th day of the ...