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Dec 30, 2011 at 20:54 comment added Shalom Again, 90 East is based on Baal HaMaor's reading of Rosh Hashanah 20b, has to be noon in Jerusalem. 180 East is based on several things, one of them being the Gemara's calling Jerusalem "the center of the world."
Dec 30, 2011 at 18:14 comment added Seth J Shalom, that's exactly the type of source I mean. I know the Chazon Ish and others have given various opinions in degrees east and west of Jerusalem, but what I want to know is, on what basis do they stake their opinions?
Dec 30, 2011 at 16:10 history answered Shalom CC BY-SA 3.0