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Scientifically precise local time varies with longitude: a difference of 15° longitude corresponds to a one-hour difference in local time, due to the differing position in relation to the Sun. Comparing local time to an absolute measure of time allows longitude to be determined. Depending on the era, the absolute time might be obtained from a ...
The mean solar time of this meridian is the base for the Eastern Time Zone (UTC-5 during standard time). Stations belonging to the US National Weather Service begin submitting weather reports when the mean solar time of this meridian is 8:00 am. Report collection ends 30–40 minutes later and the data is used to create the day's weather ...
Consequently, noon at the Prime Meridian is rarely if ever exactly at 12:00 UTC, but rather it occurs some minutes and seconds before or after that time each day. This slight daily variation has been calculated and is listed for each day of the year in the Nautical almanac [4] under the title of Equation of time. This variation must be added to ...
The Roman day starting at dawn survives today in the Spanish word siesta, literally the sixth hour of the day (sexta hora). [ 11 ] The daytime canonical hours of the Catholic Church take their names from the Roman clock: the prime , terce , sext and none occur during the first ( prīma ) = 6 am, third ( tertia ) = 9 am, sixth ( sexta ) = 12 pm ...
day time day time day time day time 2020 20: 03:50: 20: 21:43: 22: 13:31: 21: 10:03 2021 20: 09:37: 21: ... and ends when the Sun reaches the longitude of 285 ...
At solar noon the hour angle is zero degrees, with the time before solar noon expressed as negative degrees, and the local time after solar noon expressed as positive degrees. For example, at 10:30 AM local apparent time the hour angle is −22.5° (15° per hour times 1.5 hours before noon).
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At local midnight the summer Sun culminates at 3.44°. Said another way, it does not set; it is the polar day. Solstice day arcs as viewed from either pole (90° latitude). At the time of the summer or winter solstices, the Sun is 23.44° degrees above or below the horizon, respectively, irrespective of time of day.