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

First Known Use of mean sun

1765, in the meaning defined above

Keep scrolling for more

Learn More about mean sun

Statistics for mean sun

Look-up Popularity

Time Traveler for mean sun

The first known use of mean sun was in 1765

See more words from the same year

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

one that collects or salvages junk

Get Word of the Day daily email!

Test Your Vocabulary

Time Traveler Quiz: Which Word Came First?

  • time traveler quiz which word came first
  • Which came first?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

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!