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Q&A At what distance does a zman change?

Simply put, how much physical distance on the globe/map effects a discernable change in time? If I compute the zman for something, I do so based on (for some websites) my zip code. But that zip co...

1 answer  ·  posted 3y ago by rosends‭  ·  last activity 3y ago by manassehkatz‭

Question time zmanim geography
#2: Post edited by user avatar rosends‭ · 2021-12-16T11:17:06Z (about 3 years ago)
  • Simply put, how much physical distance on the globe/map affects a discernable change in time?
  • If I compute the zman for something, I do so based on (for some websites) my zip code. But that zip code covers a large area. Is it possible within a zip code to have more than one "time" when a zman starts or ends - even to the level of the second? Should a website that asks for latitude and longitude be asking for significant subdivisions to know EXACTLY where I stand? Does a degree/minute/second cover more than just my 4 amot?
  • How many feet, yards or miles (or degrees/fractions of degrees) east/west becomes a measurable amount enough that it affects the computation of the zman.
  • This leads to a question of whether people davening in a large area like a stadium might have a situation where a zman begins or ends for one extreme side, but that hasn't happened for the other side. I wonder what the halachic implications of that would be, but first, I have to understand the range of physical space we are talking about.
  • Simply put, how much physical distance on the globe/map effects a discernable change in time?
  • If I compute the zman for something, I do so based on (for some websites) my zip code. But that zip code covers a large area. Is it possible within a zip code to have more than one "time" when a zman starts or ends - even to the level of the second? Should a website that asks for latitude and longitude be asking for significant subdivisions to know EXACTLY where I stand? Does a degree/minute/second cover more than just my 4 amot?
  • How many feet, yards or miles (or degrees/fractions of degrees) east/west becomes a measurable amount enough that it affects the computation of the zman.
  • This leads to a question of whether people davening in a large area like a stadium might have a situation where a zman begins or ends for one extreme side, but that hasn't happened for the other side. I wonder what the halachic implications of that would be, but first, I have to understand the range of physical space we are talking about.
#1: Initial revision by user avatar rosends‭ · 2021-12-16T11:16:48Z (about 3 years ago)
At what distance does a zman change?
Simply put, how much physical distance on the globe/map affects a discernable change in time?

If I compute the zman for something, I do so based on (for some websites) my zip code. But that zip code covers a large area. Is it possible within a zip code to have more than one "time" when a zman starts or ends - even to the level of the second? Should a website that asks for latitude and longitude be asking for significant subdivisions to know EXACTLY where I stand? Does a degree/minute/second cover more than just my 4 amot?

How many feet, yards or miles (or degrees/fractions of degrees) east/west becomes a measurable amount enough that it affects the computation of the zman.

This leads to a question of whether people davening in a large area like a stadium might have a situation where a zman begins or ends for one extreme side, but that hasn't happened for the other side. I wonder what the halachic implications of that would be, but first, I have to understand the range of physical space we are talking about.