Metric Prefixes
G = 109
M = 106
k = 103
c = 10-2
m = 10-3
μ = 10-6
n = 10-9
Angle Conversions
1 radian = 57.3°
60¢ = 1°
60² = 1¢
For Right Ascension:
1h = 15°
1m = 0.25° = 15¢
1s = 15²
Distances
1 A.U. = 1.496 × 108 km
1 pc = 3.09 × 1013 km = 3.26 ly
Earth:
m = 5.974 × 1024 kg
R = 6378 km
F = 1380 W (the solar constant)
Sun:
m = 1.99 × 1030 kg
R = 696000 km
L = 3.90 × 1026 W
Speed of Light (EMR)
c = 3.00 × 105 km/s
Equations:
, p in years, a in A.U.
, q
in arc sec, l
in μm, d
in m
, l
in cm, T in K
, s
= 5.67 × 10-8
W/m2K4
