sidereal month

noun

Definition of sidereal month

  1. :  the mean time of the moon's revolution in its orbit with reference to a star's position :  27 days, 7 hours, 43 minutes, 11.5 seconds of mean time

First Known Use of sidereal month

1833


Learn More about sidereal month


Seen and Heard

What made you want to look up sidereal month? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

sad or melancholy

Get Word of the Day daily email!

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!