107 Gauging Distances
Channel: The Math Rebbe
Date: 2016-09-01

The video you've all been waiting for. We get to block out the sun! Oh, and there's some other trig stuff in there, too.
Sources:
Eruvin 43b
Shabbos 100a
Shulchan Aruch and Rema, OC 345:2
Mishnah Berurah 345:5
Dirshu Mishnah Berurah, OC 345
Tamid 32a with Meforash, 32b
Bamidbar Rabbah 16:25