15 gen 1609 anni - Mars has an elliptical orbit
Descrizione:
Johannes Kepler published Astronomia Nova, which contains the two laws of planetary motion. His first law, which was a revolutionary idea at the time, assumes that Mars has an elliptical orbit. Prior to this, people believed that all orbits must have been circular.Aggiunto al nastro di tempo:
Data:
15 gen 1609 anni
Adesso
~ 415 years ago
