Details Title: Astronomy 120 Exam 1 (Ball State) Description: ASTRO 120; Instructor: Dr. Robertson Total Flash Cards: 10 Created: 09/16/2009 13:23:57		New Users: To study from this flashcard set, or to create your own your own study flash cards, REGISTER HERE. Existing Users: CLICK HERE. Additional Astronomy Flashcards
Cards in this set: Term Astronomical Units Definition Distance from Earth to the Sun Term Light Years Definition The distance light travels in one year Term Zenith Definition The very top of the sky to the observer Term Nadir Definition Top of the sky on the opposite side of the planet to the observer Term Siderial Day Definition 23 hours 56 minutes; 1 cycle of the stars Term Solar Day Definition 24 hours; One sun cycle Term Rotation Definition Earth turns on its axis Term Revolution Definition Earth travels around the sun Term Precession Definition The Earth gradually changes direction of its axis over 26,000 years Term Siderial Month Definition 27.3 days; 1 cycle of the moon