[Avodah] QUESTION RE: FASTING

[cantorwolberg at cox.net]

The following question was posed to me and I gave an educated guess.
However, I'd like an halachic response with sources.
Thanks.


I will be flying back from Poland where I'll be teaching the day of Tisha b'Av.
Because of the time difference, if I were to go by sunset for ending the fast,
it would add 6 hours additional than were I to have remained in Poland. What
does halacha say about this? If I fast for the 25 or so hours, then it will be 
daylight where I land. 



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