right ascension

noun

Definition of right ascension

: the arc of the celestial equator between the vernal equinox and the point where the hour circle through a given body intersects the equator reckoned eastward commonly in terms of the corresponding interval of sidereal time in hours, minutes, and seconds

First Known Use of right ascension

15th century, in the meaning defined above

Keep scrolling for more

Learn More About right ascension

Time Traveler for right ascension

Time Traveler

The first known use of right ascension was in the 15th century

See more words from the same century

Dictionary Entries Near right ascension

right-angular

right ascension

right at

See More Nearby Entries 

Statistics for right ascension

Cite this Entry

“Right ascension.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/right%20ascension. Accessed 28 Jul. 2021.

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

More from Merriam-Webster on right ascension

Britannica.com: Encyclopedia article about right ascension

WORD OF THE DAY

Test Your Vocabulary

Difficult Spelling Words Quiz

  • alphabet pasta spelling help
  • Which is the correct spelling?
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!