Physical Constants
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| pi | 3.14.. | 3.14159 |
| ee | 2.71.. | 2.71828 |
| c | light vel. | 2.99792e+08 m/s |
| G | grav. const | 6.67259e-11 N.m2/kg2 |
| h | Planck const | 6.62608e-34 J.s |
| HI | HI line | 1420.41 MHz |
| R | gas const | 8.31451 J/K/mol |
| NA | Avogadro # | 6.02214e+23 mol-1 |
| e | electron charge | 1.60218e-19 C |
| mp | proton mass | 1.67262e-27 kg |
| mp_me | mp/me | 1836.15 |
| mu0 | permeability vac. | 1.25664e-06 H/m |
| eps0 | permittivity vac. | 1.60218e-19 C |
| k | Boltzmann const | 1.38066e-23 J/K |
| F | Faraday const | 96485.3 C/mol |
| me | electron mass | 9.10939e-31 kg |
| re | electron radius | 2.8179e-15 m |
| a0 | Bohr’s radius | 5.2918e-11 m |
| R0 | solar radius | 6.9599e+08 m |
| k2 | IAU grav. const^2 | 0.000295912 AU3/d2/S0 |
