Question

Rabbi, in your view, since a fast means “not eating for a period of time” [and a practical implication of this (in principle, not necessarily in actual practice) would be that someone who ate in the middle of the day does not need to continue, since there is no longer any “fasting for a period of time”; or a minor who developed two pubic hairs in the middle of the fast and had not been fasting from the beginning is not obligated to fast now, since here too there is no “period of time”], is it conceivable that there could be some country such that between France and that country there is, say, a 20-hour time difference, and I fly there a few hours after the fast began for me, so that I arrive there when the stars have already come out and the fast has already ended for them—would I still be obligated to continue fasting because I have not completed the “period of time” required by the definition of the fast? (Apparently that is not a sensible possibility, so I’m asking about the definition…)