ch 22.1 assessment

summarize Kepler's three laws of planetary motion

Law of Periods: the cube of the average distance of a planet from the sun is always proportional to the square of the period. K*a3=p2

what produces the retrograde motion of Mars

apparent westward drift

compare and contrast the geocentric and heliocentric models of the universe

geocentric is an Earth centered universe. heliocentric is a sun centered universe

what role did the telescope play in Galileo's contributions to science

Galileo used the telescope to prove that Copernicus was correct.

what major change did Copernicus make in the Ptolemaic system? why was this change significant

he concluded that the earth was a planet and was not the center of the universe. that explained many things

what geometric arrangements did Ptolemy use to explain retrograde motion

he looked at the planets and compared the stars