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The Chai Air Tables are a fantastic tool I've used many times and have seen others use many times. One simply inputs one's flight route (i.e. source, destination, departure date and time) and the website provides a table (including additional columns for each 15-minute interval of delay) of different Halakhically-relevant times. Here is an example of what ...


The verse in Tehillim (107:23) from which we derive the law explicitly mentions ships: יוֹרְדֵי הַיָּם בָּאֳנִיּוֹת עֹשֵׂי מְלָאכָה בְּמַיִם רַבִּים - "They that go down to the sea in ships, that do business in great waters" From this I would infer that your first case of swimming is clearly fine (though it's worth noting that the continuing verses ...


Mishna Berura 94:10 says that is one is in middle of Tefila and was made aware that he is facing the wrong direction he may not move his feet, he should move his face to face Mizrach. If that is not possible then he should have in mind "Mechaven Libo" the holy of holies "Kodesh Hakodoshim".


According to many opinions, as recorded in answers to "Praying on an airplane", one should remain in one's seat for prayers while on a commercial flight. Presumably, according to them, one's orientation would remain aligned with the direction of the seat the whole time, regardless of the bearing to Jerusalem. This indicates that according to these opinions, ...

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