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Questions seeking sources for a given practice in general or in specific Jewish communities, alternatively seeking the location of a specific source of a teaching/idea/philosophy based on Torah writings.
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votes
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answer
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R' David Tzvi Hoffman's sun depression angle for nightfall
The time lapse between sunset and nightfall (i.e. the length of twilight) depends mainly on the observer's latitude and the time of year (and also, to a lesser degree, on atmospheric conditions.) Some …