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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