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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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Chaim cohen, welcome to Judaism.SE! Your question may have already been addressed here: judaism.stackexchange.com/questions/4916/… – Dave Jul 5 '11 at 19:32
I am certain the answer to this question will depend on in what year the travel takes place. – WAF Jul 5 '11 at 22:01


This link has the information you are looking for.

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It seems to me that that document does not provide the time of alos hashachar on the desired day, but a recommendation of a program that will generate tables that do. The program, Chai Air Travel, generates information for specific flights here: chaitables.com/chai_air_eng.php . I believe it gives the result as 4:22am for the flight in question. – WAF Jul 5 '11 at 22:24

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