Shalom CoC!

good to see you again!
That's a good question.
Today's parsha was on Numbers 20 where Miriam died.
Many don't look at these three siblings as the leaders of Israel in the wilderness.
But there were three of them, Miriam who was the 'savior' of Moses, Aaron who was the High Priest
and Moses.
Don't know if that has any significance or not but that's what's brought to mind right now.
Great Rabbis of the previous generations (especially Rav Tukachinkski zt"l) calculated that these three stars (and the absence of red in the western sky) occurs 32 minutes after sunset in winter, and up to 38 minutes in summer. This is when the sun is 8 degrees below the horizon. This calculation of 8 degrees below the horizon is used in many (most?) countries - and comes out to 50-60 minutes in Europe and America. It gets longer as one goes north.
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IN all that I've read on this there doesn't seem to be any reason behind the choice of three. Some say three small stars, others say three medium stars (which means the small stars would mean others could be seen), so after finding no specific reason in the Talmud a thought came to me that it was G-ds witnessing that Shabbat is over.
Deuteronomy 17:6 On the testimony of two or three witnesses a ...
Yeshua taught the same:
Matthew 18:16 But if they will not listen, take one or two others ... ... But if they will not listen, take one or two others along, so that '
every matter may be established by the testimony of two or three witnesses.' ...