Equation of Time
978-613-1-74124-1
6131741247
88
2010-07-13
34.00 €
eng
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The equation of time is the difference between apparent solar time and mean solar time, both taken at a given place at the same real instant of time. Apparent solar time can be obtained for example by measurement of the current position of the Sun, or indicated by a sundial. Mean solar time, for the same place, would be the time indicated by a steady clock set so that its differences over the year from apparent solar time average to zero. The equation of time varies over the course of a year, in a way that is almost exactly reproduced from one year to the next. Apparent time, and the sundial, can be ahead by as much as 16 min 33 s, or behind by as much as 14 min 6 s. The equation of time results mainly from two different superposed astronomical causes, each causing a different non-uniformity in the apparent daily motion of the Sun relative to the stars, and contributing a part of the effect: the obliquity of the ecliptic, which is inclined by about 23.44 degrees relative to the plane of the Earth's equator; and the eccentricity and elliptical form of the Earth's orbit around the Sun.
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Physics, astronomy
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