Technical data

Appendix B 47
Appendix B
Constants
Astronomical Unit = 1.4959787066 x 10
11
m
Parsec = 3.26 ly
= 3.086 x 10
16
m
Light-year = 9.46 x 10
15
m
Gravitational Constant = 6.672 x 10
-11
m
3
kg
-1
s
-2
Velocity of Light = 299792458 m/s
Sidereal Year = 365.26 days
Mass of the Earth = 5.98 x 10
24
kg
Radius of the Earth = 6378.160 km
at the Equator
Orbital Velocity = 30 km/sec
of the Earth
Mass of the Sun = 1.9891 x 10
30
kg
Radius of the Sun = 6.96 x 10
5
km
Luminosity of the Sun = 3.90 x 10
26
W
Effective Temperature = 5780° K
of the Sun
Mass of the Moon = 7.35 x 10
22
kg
Radius of the Moon = 1738 km
Radius of the Moon's = 3.84 x 10
5
km
Orbit
Sidereal Month = 27.3 days
Synodic month = 29.5 days
Distance of the Sun = 8.5 kpc
from the center of
the Galaxy
Velocity of the Sun = 220 km/sec
about the Galactic
Center
Diameter of the Galaxy = 120 kpc
Mass of the Galaxy = 7 x 10
11
solar masses