Lots of discussion around the fact that Hanukkah and Thanksgiving occur at the same time this year. "How is that possible?" "Hanukkah is always in December." "Isn't Hanukkah early this year?" Well, here's the reason:
The Jewish holidays are never early or late; they are always on time, according to the Jewish calendar.
Unlike the Gregorian (civil) calendar, which is based on the sun (solar), the Jewish calendar is based primarily on the moon (lunar), with adjustments made to account for the differences between the solar and lunar cycles. Therefore, the Jewish calendar might be described as both solar and lunar. The moon takes an average of 29-1/2 days to complete its cycle; 12 lunar months equal 354 days. A solar year is 365-1/4 days. There is a difference of 11 days per year. To ensure that the Jewish holidays always fall in the proper season, an extra month is added to the Hebrew calendar seven times out of every 19 years.
Therefore, Hanukkah is always the 25th day of the month of Kislev, which this year just happens to fall on November 27, the day before Thanksgiving.
And now you know...