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Astronomy

Chapter 22

TermDefinition
retrograde motion the apparent westward motion of the planets with respect to the starts
rotation the spinning of a body on its axis
universal gravitation the greater the mass of the object the greater the gravitational force
waxing getting bigger
Copernicus concluded Earth is a planet and the sun in the center of the universe
precession motion of the Earth's axis tracing a circle over 26,000 years
sidereal a lunar motion that takes 27 1/3 days
Newton a famous scientest who proved the force of gravity
helio- sun
waning To decrease in strength or intensity
Kepler A german astronomer. First name Johannes
peri- Closest point to the Earth
Galileo astronomer, physicist, mathematician, inventor, and philosopher
ap- the farthest point from Earth
astronomical unit average distance from Earth to the sun; 1.5x108
revolution the motion of one body about another, as Earth about the sun.
synodic relating to or involving the conjunction of stars, planets, or other celestial objects.
-gee "of the moon"
moon sandwich solar eclipse
earth sandwich lunar eclipse
Created by: Mrs.Stichter
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