Saturday, January 14, 2012

Astronomical Constants


Astronomical Constants
Constant
Value

Astronomical unit (au)
149,597,870 km
Speed of light in a vacuum (c)
299,792.458 km/sec
Solar parallax
8.794148 arc seconds
Mass of the sun
1.9891 × 1030 kg
Mass of the earth
5.9742 × 1024 kg
Mass of the moon
7.3483 × 1022 kg
Light-year (ly)
9.4605 × 1012 km = 0.30660 pc
Parsec (pc)
30.857 × 1012 km = 3.26161 ly
Obliquity of the eliptic (2000)
23 ° 26 ' 21.448 '
General precession (2000)
50.290966 arc seconds/year
Constant of nutation (2000)
9.2025 arc seconds
Constant of aberration (2000)
20.49552 arc seconds

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