Site Map | FAQ

• Editor's Favorites
  • Answerplease: A new Q & A site
  • Asian Pacific American Heritage Month
  • Gay Pride Month
  • Everest Almanac
  • Memorial Day
  • Conversion Calculator
  • Campaign 2012
  • Country Profiles
  • Most Populous Cities of the World
  • Holidays in America
  • 50 States
  • Color Psychology
  • Top 50 U.S. Cities
  • Infoplease's Facebook page
  • Follow Infoplease on Twitter

 

Dictionary

as'tronom'ical twi'light

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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

astronomical triangle

astronomical unit

• • Cite
  • Print
  • Email
  • Bookmark
    • Add bookmark
    • Add to del.icio.us
    • Digg It!
    • Add to Reddit

Related Content Daily Word Quiz: hortatory Analogy of the Day: Today's Analogy Spelling Bee: Today's Spelling Bee Kids' Word Quiz: weary Crossword: Crossword Puzzle Guide Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language

Find definitions for: