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Day | A Wisdom Archive on Day | | Day A selection of articles related to Day | |
| We recommend this article: Day - 1, and also this: Day - 2. |
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More material related to Day can be found here:
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day, Day, Day - Astronomy, Day - Boundaries of the day, Day - Civil day, Day - Colloquial definition of day, Day - Definition of a day in SI, Day - Definition of a day in astronomy, Day - Introduction, Day - Leap seconds, Day - List of famous days, Day - Origin, Day - People named Day, times from 10 kiloseconds to 100 kiloseconds, night, Calculating the day of the week, Daylight saving time, season, for a discussion of daylight and darkness near the poles and the equator and places in-between, Dagr, Battle of Day's Gap
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ARTICLES RELATED TO Day | |
| | |  Day: Encyclopedia II - Day - Definition of a day in astronomy
For a given planet, there are two types of day defined in astronomy:
1 apparent sidereal day = a single rotation of a planet with respect to the distant stars (for Earth it is 23.934 solar hours or 24 sidereal hours)
1 solar day = a single rotation of a planet with respect to Sun.
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See also:Day, Day - Definition of a day in SI, Day - Definition of a day in astronomy, Day - Origin, Day - Colloquial definition of day, Day - Introduction, Day - Civil day, Day - Leap seconds, Day - Astronomy, Day - Boundaries of the day, Day - List of famous days, Day - People named Day Read more here: » Day: Encyclopedia II - Day - Definition of a day in astronomy |
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| | | | Day: Encyclopedia II - Day - Civil day For civil purposes a common clock time has been defined for an entire region based on the mean local solar time at some central meridian. Such time zones began to be adopted about the middle of the 19th century when railroads with regular schedules came into use, with most major countries having adopted them by 1929. For the whole world, 39 such time zones are now in use. The main one is "world time" or ...
See also:Day, Day - Definition of a day in SI, Day - Definition of a day in astronomy, Day - Origin, Day - Colloquial definition of day, Day - Introduction, Day - Civil day, Day - Leap seconds, Day - Astronomy, Day - Boundaries of the day, Day - List of famous days, Day - People named Day Read more here: » Day: Encyclopedia II - Day - Civil day |
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| | | | Day: Encyclopedia II - Day - Introduction Different definitions of the day are based on the apparent motion of the Sun across the sky (solar day; see solar time). The reason for this apparent motion is the rotation of the Earth around its axis, as well as the revolution of the Earth in its orbit around the Sun.
A day, as opposed to night, is commonly defined as the period during which sunlight directly reaches the ground, assuming that there are no local obstacles. Two effects make days on average longer than nights. The Sun is not a point, but has an apparent size of about 3 ...
See also:Day, Day - Definition of a day in SI, Day - Definition of a day in astronomy, Day - Origin, Day - Colloquial definition of day, Day - Introduction, Day - Civil day, Day - Leap seconds, Day - Astronomy, Day - Boundaries of the day, Day - List of famous days, Day - People named Day Read more here: » Day: Encyclopedia II - Day - Introduction |
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