Current options for setting the start of the day are:
Sunrise;
Civil Twilight;
Can you add Sunset to that list?
Jewish Shabbat begins at Sunset, and ends when three stars can be seen, after the following sunset. (OK, technically, the day begins begins with the sun is 16.1, 18, 19.8 degrees below the horizon, or 120, 96, or 72 minutes before the upper limb of the sun touches the horizon. Hours, however, are counted from when the upper limb touches the horizon.)
nognkantoor
commented
4 years ago
Current options for setting the start of the day are:
Can you add Sunset to that list?
Jewish Shabbat begins at Sunset, and ends when three stars can be seen, after the following sunset. (OK, technically, the day begins begins with the sun is 16.1, 18, 19.8 degrees below the horizon, or 120, 96, or 72 minutes before the upper limb of the sun touches the horizon. Hours, however, are counted from when the upper limb touches the horizon.)