Various constants and reference quantities
Fundamental physical constants
Article REF: K60 V1
Various constants and reference quantities
Fundamental physical constants

Author : Jean-Claude COURTIER

Publication date: January 10, 1988 | Lire en français

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2. Various constants and reference quantities

2.1 Geometric and mechanical quantities

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2.1.1 Astronomical unit

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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