Definition  Value 
Mass of Earth 
m _{E} = 5.98 × 10^{24} Kg

(mean) Radius of Earth 
r _{E} = 6.4 × 10^{6} m

Mass of Moon 
m _{M} = 7.36 × 10^{22} Kg

(mean) Radius of Moon 
r _{M} = 1.74 × 10^{6} m

Mass of Sun 
m _{s} = 1.99 × 10^{30} Kg

(mean) Radius of Sun 
r _{s} = 6.96 × 10^{8} m

Acceleration due to Earth Gravity (near surface of Earth) 
g = 9.8 m/s^{2}

Speed of Light in Vacuum 
c = 3.00 × 10^{8} m/s

Gravitational Constant (appears in Newton's law of universal gravitation) 
G = 6.67 × 10^{11} N·m^{2} / kg^{2}

Permeability in Vacuum 
μ_{0} = 4π × 10^{7} T·m / A

Permittivity in Vacuum 
ε_{0} = 8.854 × 10^{12} F / m

Coulomb's Constant (in Coulomb's Law) 
k = 9.00 × 10^{9} N·m^{2}/C^{2}

Planck's constant h 
h = 6.63 × 10^{34} J·s

Elementary Charge e 
e = 1.60 × 10^{19} C

Mass of Electron 
m_{e} = 9.109 × 10^{31} Kg

Mass of Proton 
m_{p} = 1.673 × 10^{27} Kg

Mass of Neutron 
m_{n} = 1.675 ×10^{27} Kg
