The flight from Tokyo to London
is thirty-five hours long. 1) To determine the proper time for the daily
prayers, do you use the sunset and sunrise of one city or the other,
or somewhere in the middle? I've heard many intriguing arguments, but
they can't all be correct! 2) And what
if the day is Tisha b'Av? Can a fast be mandatory for 35 hours?
Moshe Hittman / New York
This is not an "official" answer, just
another opinion for your collection.
1) On the plane, daybreak, sunrise, sunset and nightfall
times are established according to the location of the plane. But be careful:
these times are all defined from an earth perspective, not a sky one.
When you see light from the plane, that doesn't mean there is light yet
down on the surface.
2) Anyone who flies from Tokyo to London on Tisha
b'Av deserves to fast for 35 hours.