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Kepler's Third Law Calculator
Calculate orbital period or semi-major axis using Kepler's Third Law
📖 Kepler's Third Law
Kepler's Third Law states that the square of the orbital period is proportional to the cube of the semi-major axis. For circular orbits: T² = (4π²/GM) × a³.
📊 Result
💡 Tips & Information
- Formula: T² = (4π²/GM) × a³
- For Earth: T² = a³ (when T in years, a in AU)
- 1 AU = 1.496 × 10¹¹ meters
- 1 solar mass = 1.989 × 10³⁰ kg
- This law applies to all elliptical orbits around a central body