2. Various constants and reference quantities
2.1 Geometric and mechanical quantities
The value 1 AU = 149,600 × 10 6 m is adopted by convention in the International Astronomical Union's system of astronomical constants.
The astronomical unit is roughly equal to the radius of the undisturbed circular orbit of a body of negligible mass moving around the Sun with a sidereal angular velocity of 0.017,202,098,950 radians per day of 86,400 ephemeris seconds (cf. the article...
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Various constants and reference quantities
Values of some standards in SI units
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