sidereal time

noun

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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The watch has 12 complications, including a cathedral minute repeater, tourbillon, perpetual calendar, sidereal time and sky chart. Carol Besler, Robb Report, 11 Dec. 2023 The space traveler is a multi-complication pocket watch, with double-wheel escapement, mean solar and sidereal time, an annual calendar, age and phase of the moon and the equation of time. Carol Besler, Robb Report, 4 Jan. 2023 The pink gold masterpiece includes 12 complications, including a cathedral minute repeater, tourbillon, perpetual calendar with retrograde date, moon age and angular motion, sidereal time and sky chart. Carol Besler, Robb Report, 5 Jan. 2023 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

Word History

First Known Use

1765, in the meaning defined at sense 1

Time Traveler
The first known use of sidereal time was in 1765

Dictionary Entries Near sidereal time

Cite this Entry

“Sidereal time.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sidereal%20time. Accessed 1 Dec. 2024.

More from Merriam-Webster on sidereal time

Love words? Need even more definitions?

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