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Commencing Shabbos

If one is located behind a mountain, what time is Shkiya or Tzeis?

  1. Is it when the sun sets below the "calculated" horizon (when the sun should set had the mountain not been there)?
  2. Is it when the sun sets behind the mountain?

What if one is on top of a mountain? Is Shkiya/Tzeis affected the same way?

What if one is on top of a building, is Shkiya when the sun sets for him or when it sets for people on ground level?


  • 2
    possible duplicate: judaism.stackexchange.com/q/1284/759
    – Double AA
    Mar 28, 2012 at 5:28
  • @DoubleAA, thank you! I knew we've had this before, and couldn't find it. Anyone: any reason this should not be closed as duplicate?
    – msh210
    Mar 28, 2012 at 16:05


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