LU: From what I heave read (and it certainly is not everything on the subject), most people did not fast two days and did not daven the Yom Kippur davening both days. The machlokes as to where the dateline is, is based on a gemorrah in Mesechta Rosh Hashana that discussed how Rosh Chodesh was established in the times of the Beis Hamikdosh. The Chazon ish based his psak on the Ba’al Hamoar who wrote that the dateline is 6 hours east of EY. R’ Tuckazinsky holds the dateline is at a longitude that is between Hawaii and the mainland USA. Therefore, Japan is 7 hours ahead of EY just like the International dateline. My disagreement with Geordie13 is what day they davened and fasted for Yom Kippur.
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