sidereal time

noun

Definition of sidereal time

1 : time based on the sidereal day
2 : the hour angle of the vernal equinox at a place

Examples of sidereal time in a Sentence

Recent Examples on the Web The sky chart is a disk that rotates at a speed of sidereal time (23 hours, 56 minutes and 4 seconds). Roberta Naas, Forbes, 7 Apr. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'sidereal time.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of sidereal time

1765, in the meaning defined at sense 1

Keep scrolling for more

Learn More About sidereal time

Time Traveler for sidereal time

Time Traveler

The first known use of sidereal time was in 1765

See more words from the same year

Dictionary Entries Near sidereal time

sidereal second

sidereal time

sidereal year

See More Nearby Entries 

Statistics for sidereal time

Cite this Entry

“Sidereal time.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sidereal%20time. Accessed 25 Oct. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon
Seen & Heard
People are talking about

More from Merriam-Webster on sidereal time

Britannica.com: Encyclopedia article about sidereal time

WORD OF THE DAY

Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Love words? Need even more definitions?

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