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Astronomy - Chapter 7 (Worksheet 1)

Across
Means "earth-centered," or the idea that the earth remained motionless while the sun orbited it
A smaller circle that moved on a larger circle that Ptolemy used to explain retrograde motion of planets
Three laws that describe the motions of the planets discovered by Johannes Kepler
Down
Means "sun-centered," or the theory that planets of our solar system orbit around the sun
When a planet appears to move east to west with respect to the stars, opposite its normal motion
The study of motion, energy, matter, and force
The visual shift slightly back and forth each year of the stars, based on where we are viewing it from either side of earth's orbit