law of areas

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a law concerning the speed at which planets travel;
a line connecting a planet to the sun will sweep out equal areas in equal times
- Kepler's second law means that a planet's orbital speed changes with its distance from the sun
• Syn:
Kepler's second law, law of equal areas
• Hypernyms:
Kepler's law, Kepler's law of planetary motion