| pi | ~ 3.141592654 |
| G | = gravitational constant |
| c | = speed of light |
| Msun | = Mass of Sun |
| Rsun | = Radius of Sun |
| Lsun | = Luminosity of Sun |
| m2AU | = meters to AU |
| AU2m | = AU to meters |
| s2yr | = seconds to years |
| s2hr | = seconds to hours |
| r2d | = radians to degrees |
| d2r | = degrees to radians |
|
| Mp | = mass |
| ap | = semimajor axis |
| Rp | = radius |
| rhop | = density |
| Vop | = orbital velocity |
| ep | = eccentricity |
| J2 | = oblateness |
| tp | = tilt |
|
| M | = mass |
| R | = radius |
| a | = Semimajor axis |
| rho | = density |
| e | = eccentricity |
| i | = inclination |
| Vo | = Orbital Velocity |
| Hr | = Hill Radius |
| Ve | = Escape Velocity |
| Po | = Orbital Period |
| gs | = Surface gravity |
| Rsyn | = Synchronous Orbit |
|
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