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

The average period of the revolution of the Moon about the Earth with respect to the → vernal equinox, a period of 27.321 582 days (27d 7h 43m 4.7s).

→ tropical; → month.

Mâh, → month; hamugâni, of or pertaining to hamugân, → equinox.