sidereal hour


: the 24th part of a sidereal day

Word History

First Known Use

circa 1695, in the meaning defined above

Time Traveler
The first known use of sidereal hour was circa 1695

Dictionary Entries Near sidereal hour

Cite this Entry

“Sidereal hour.” Dictionary, Merriam-Webster, Accessed 23 Jul. 2024.

Love words? Need even more definitions?

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