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

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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