astronomical unit wikipedia - EAS
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The astronomical unit (symbol: au, or AU or AU) is a unit of length, roughly the distance from Earth to the Sun and equal to 150 million kilometres (93 million miles) or 8.3 light-minutes. The actual distance from Earth to the Sun varies by about 3% as Earth orbits the Sun, from a maximum … Meer weergeven
A variety of unit symbols and abbreviations have been in use for the astronomical unit. In a 1976 resolution, the International Astronomical Union (IAU) had used the symbol A to denote a length equal to the astronomical … Meer weergeven
Earth's orbit around the Sun is an ellipse. The semi-major axis of this elliptic orbit is defined to be half of the straight line segment that … Meer weergeven
The book On the Sizes and Distances of the Sun and Moon, which is ascribed to Aristarchus, says the distance to the Sun is 18 to 20 times the distance to the Moon, whereas the … Meer weergeven
With the definitions used before 2012, the astronomical unit was dependent on the heliocentric gravitational constant, that is the product … Meer weergeven
The unit distance A (the value of the astronomical unit in metres) can be expressed in terms of other astronomical constants:
where G is the Meer weergeven• Williams, D.; Davies, R. D. (1968). "A radio method for determining the astronomical unit". Monthly Notices of the Royal Astronomical Society. 140 (4): 537. Bibcode Meer weergeven
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