1

Who knows two hundred nine?

Please cite/link your sources, if possible. At some point at least twenty-four hours from now, I will:

  • Upvote all interesting answers.

  • Accept the best answer.

  • Go on to the next number.

3

A solar year has appx 365 days.

A lunar year has appx 354 days.

The 11 day difference adds up to 209 days on average missing over a 19 year period (11 x 19 = 209) thus 7 out of every 19 years we add in a second Adar to make up for this shortfall.

1

Well, if the yishuv in Mitzrayim was 210, and the makkos lasted a year prior משפט המצריים, שנים עשר חודש (Mish. Ed. 2:10) , that would be...209!

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