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If you really need to, you can say Maariv and Havdalah (omitting the blessing on the candle) from Plag HaMincha (1.25 hours before sunset) (ShA OC 293:3) just as much as you can say Maariv and Kiddush after that time on Friday. The blessing on the candle can be recited separately after nightfall. All labor remains forbidden until after nightfall (even after ...


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Not the amount of difference you mentiond but I believe it is similiar. Check last time for chametz section here כל ההבדל בין האשכנזים לספרדים הוא, שאנחנו מחשבים את היום מעמוד השחר עד 20 דקות אחרי השקיעה, ואילו האשכנזים מחשבים את היום בחשבון אחר, ולדעת הגאון מוילנא היום מתחיל מהנץ החמה ועד השקיעה, ולפי"ז יוצא זמן ארבע שעות זמניות בחשבון אחר. All the ...


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In Talmud Bavli Rosh Hashanna 20b, R' Zeira quotes R' Nachman as saying: כ"ד שעי מכסי סיהרא לדידן שית מעתיקא ותמני סרי מחדתא לדידהו שית מחדתא ותמני סרי מעתיקא For 24 hours, the [moon] light is covered: For us [in Babylon] - 6 of the old [month] and 18 of the new [month]; for them [in Jerusalem] - 6 of the new and 18 of the old. (Translation ...


2

I personally asked this question to Rav Avigdor Nebenzahl former Chief Rabbi of the Old City. He told me that one should light a flashlight (one with a filiment in the bulb, not LCD) and may even make a brocha on it. He also said it should be placed in the front pocket of the seat. And after a half hour it may be turned off. He also noted that the lights ...


1

In regards to time bound mitzvos in general Rabbi Menahem Kasher ruled that “The situation on the moon [or Mars] is equivalent to the north and south poles; therefore posit a 24-hour day, with alternating periods of 12 hours day and 12 hours night regardless of the presence or absence of light from the sun”. quoted here. The same would presumably be true ...



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