Dictionary

hour circle

hour circle

noun

Definition of HOUR CIRCLE

:  a circle on the celestial sphere that passes through both celestial poles

First Known Use of HOUR CIRCLE

1690

Browse

Next Word in the Dictionary: hourglass (noun)Previous Word in the Dictionary: hour angleAll Words Near: hour circle
March 06, 2015
eolian Hear it
Deposited, produced, or eroded by wind
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears