mean sun

noun

Definition of mean sun

: a fictitious sun used for timekeeping that moves uniformly along the celestial equator and maintains a constant rate of apparent motion equal to the average rate of apparent motion of the real sun

Examples of mean sun in a Sentence

Recent Examples on the Web This meant Sun, who had initially finished second, was moved into first place. Ben Church, CNN, "Controversial swimming star Sun Yang reacts angrily after opponent refuses to share podium," 23 July 2019

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

First Known Use of mean sun

1765, in the meaning defined above

Keep scrolling for more

Learn More about mean sun

Time Traveler for mean sun

Time Traveler

The first known use of mean sun was in 1765

See more words from the same year

Statistics for mean sun

Cite this Entry

“Mean sun.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/mean%20sun. Accessed 8 December 2019.

Comments on mean sun

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

WORD OF THE DAY

to constrict the range or activity of

Get Word of the Day daily email!

Test Your Vocabulary

Semantic Drift Quiz

  • a twisty river
  • Which of the following was once a synonym for fun?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

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!