ephemeris time

noun

Definition of ephemeris time

: a uniform measure of time defined by the orbital motions of the planets

First Known Use of ephemeris time

1950, in the meaning defined above

Keep scrolling for more

Learn More About ephemeris time

Time Traveler for ephemeris time

Time Traveler

The first known use of ephemeris time was in 1950

See more words from the same year

Statistics for ephemeris time

Cite this Entry

“Ephemeris time.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ephemeris%20time. Accessed 22 Jun. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More from Merriam-Webster on ephemeris time

Britannica.com: Encyclopedia article about ephemeris time

WORD OF THE DAY

Test Your Vocabulary

Return of Name that Color!

  • a light greenish blue color
  • Name that color:
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
 AlphaBear 2

Spell words. Make bears.

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!