ATPL: The first law of Kepler states:
Domanda 196, General Navigation - ATPL - Airline Transport Pilot license
| The angular speed of the planet in the orbit around the sun is constant. |
| Planets move around the sun in a circular orbit. |
| Planets move in elliptic orbits with the sun in one of the foci. |
| All planets orbit around the sun at the same speed. |
