Monday, July 3, 2017

tefilla - Alos Hashachar on a flight from Israel to Toronto


What time will a person cross alos hashachar (first light of the sun) if he is flying from Israel to Toronto on the night of the fast of the 17th of Tammuz? The flight leaves Israel at one in the morning and arrives at 6 in the morning in Toronto.




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periodic trends - Comparing radii in lithium, beryllium, magnesium, aluminium and sodium ions

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