An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

The movement of a celestial body which is in orbit around another. It is often measured as the → orbital period.

Verbal noun of → revolve.

The time taken by a planet or satellite to complete one revolution about its primary with respect to stars. For Earth, same as → sidereal year.

→ sidereal; → revolution; → period.