| Constant | Symbol | Value |
| Speed of light | c | 3.0 x 108 m/s |
| Gravitational Constant | G | 6.67 x10-11 m3/kg/s2 |
| Planck's Constant | h | 6.63 x 10 -34 J sec |
| Boltzmann's Constant | k | 1.38 x 10-23 J/K |
| Stefan-Boltzmann Constant | |
5.67 x 10 -8 W/m2 / K4 |
| Mass of hydrogen atom | mH | 1.67 x 10-27 kg |
| Mass of electron | me | 9.11 x 10-31 kg |
| Sidereal year | 1 year | 3.16 x 107 s |
| pi | |
3.1415 |
| Constant | Symbol | Value |
| Astronomical Unit | A. U. | 1.496 x 1011 m |
| Parsec | pc | 3.09 x 1016 m |
| Light year | ly or ltyr | 9.46 x 1015 m |
| Mass of Earth | ME | 5.97 x 10 24 kg |
| Radius of Earth | RE | 6.38 x 106 m |
| Mass of Sun | Msolar | 1.99 x 1030 kg |
| Radius of Sun | Rsolar | 6.96 x 108 m |
| Luminosity of Sun | Lsolar | 3.83 x 10 26 Watts |