astronomical twilight

astronomical twilight

noun
either of two periods of partial darkness, after sunset or before sunrise, when the center of the sun is more than 6° but less than 18° below the horizon.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To astronomical twilight
Explore Dictionary.com
Previous Definition: astronomical triangle
Next Definition: astronomical unit
More from Thesaurus.com
Synonyms and Antonyms for astronomical twilight
More from Reference.com
Search for articles containing astronomical twilight
Dictionary.com Word FAQs

Dictionary.com presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.

Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature