mean solar day

noun

Definition of mean solar day 

: the interval between successive transits of a given meridian by the mean sun

Examples of mean solar day in a Sentence

Recent Examples on the Web

In the 19th century, scientific institutions worked to define the second in astronomical terms, and in the 1940s an international agreement defined the second as 1⁄86,400 of a mean solar day. Jay Bennett, Popular Mechanics, "The Centuries-Long Quest to Measure One Second," 24 Mar. 2017

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

First Known Use of mean solar day

1816, in the meaning defined above

Keep scrolling for more

Learn More about mean solar day

Share mean solar day

Statistics for mean solar day

Look-up Popularity

Time Traveler for mean solar day

The first known use of mean solar day was in 1816

See more words from the same year

Comments on mean solar day

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

WORD OF THE DAY

exaggeratedly or childishly emotional

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Roman Mythology Quiz

  • the-triumph-of-venus-by-alessandro-magnasco
  • Boreal comes from the name of the ancient Greek god of which wind?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Add Diction

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!