Planetary distances

1671 Planetary distances

The book of science

Tom Sharp

Giovanni Domenico Cassini astronomy

Planetary distances

The astronomical unit


Because planetary orbits are elliptical, the planets’ distances from the sun depends on their places in their orbits. Kepler’s laws of planetary motion describe these elliptical orbits.

Cassini was not the only famous astronomer before the Enlightenment who cast horoscopes for kings or queens.

See also in The book of science:

Readings on wikipedia: