The Constants of Astrogation
1. The Speed of Light:
2. The Astronomical Unit:
3. The Lightyear:
4. One Gee:
5. The Sun's Gravitational Constant: (for other stars, multiply by the star's mass expressed as a multiple of Sol's mass)
6. Earth's Gravitational Constant: (for other planets, multiply by the planet's mass expressed as a multiple of Earth's mass)
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1. The Speed of Light:
2. The Astronomical Unit: Originally astronomers defined the astronomical unit as the length of the semi-major axis of Earth's orbit. In 1976 the International Astronomical Union redefined it as the radius of a perfectly circular, unperturbed orbit on which a particle of negligible mass in free fall would need precisely 365.2568983 siderial days to go around it once. It has its most precise value as 149,597,870.691 meters.
3. The Light Year:
4. One Gee:
5. The Sun's Gravitational Constant:
6. Earth's Gravitational Constant:
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