Hi,
I am trying to calculate the last time for morning Shema in Manchester UK. As a guide I used the web page
http://www.myzmanim.com/day.aspx?askdefault=1&vars=39090887&q=manchester
I can calculate the Gra's time. But I get a difference when I try and calculate the Mogen Avraham's time.
Bellow are my figures. Where do you think I have gone wrong? (My times are based on 02 Feb)
Gra
Naitz: 07:53:24 - Shki'ya : 16:52:18
Sha'ot Zamani'ot: 44 mins 54 sec
Sof Zaman Shema: 10:08
Mogen Avraham
Alos: 06:05:16- Zais: 17:48:13
Sha'ot Zamani'ot: 58 mins 35 sec
My calculation Sof Zaman Shema is 09:01. The web site shows 09:14
Many thanks,
Ben Shaw, Manchester (UK)
It seems that "MyZmanim" is using the later time for Alos ha'Shachar -- 72 minutes before the Shekiyah -- instead of the earlier one -- 90 minutes before. If you work through the calculations, you get their time of 09:14.
b'Hatzlachah,
Yonasan