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We can now measure time more accurately than in the past (see this question). What are the implications? I do not ask about situations where the time is critical for a Torah law where obviously one should make sure that the time chosen is in the permitted zone.

But consider for example the time for Honetz Hachamah on a day when the sun is not visible. In earlier times, assume this time could have determined to within 5 minutes. My question is whether I have to time my Amidah to the nearest minute on my clock or whether I can rely on the practice of earlier times and within 5 minutes either side would be still constitute tefillo at Honetz Hachamah.

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  • Why assume the practice in earlier times was to just get within 5 minutes of either side? Maybe on cloudy days they purposefully aimed late or something like that? – Double AA Oct 13 '20 at 12:39
  • For Honetz Hachamah.which to choose, early or late? – Avrohom Yitzchok Oct 13 '20 at 17:17
  • Which is worse: shma after sunrise or amida before sunrise? Id think the latter is worse. – Double AA Oct 14 '20 at 1:00

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