Early Astronomy 4/21/1518-1b pgs. 486-488

• IN: Draw a diagram showing rotation and revolution.•Open a book to pg. 486

Early Astronomers• Ptolemy (140 AD) – Earth was

center of the Universe (geocentric).

• Copernicus (1543) – the Sun is the center of the Universe (heliocentric).

• Tycho Brahe (1546) – Earth was center but the planets orbit the Sun.

• Kepler (1606) – that all the planets revolve around the sun in elliptical orbits.

• Galileo (1642)– used a telescope to observe objects in the sky.

• Newton (1726) – explained inertia and gravity keeps all objects in the orbit.

OUT: Is Copernicus’ theory completely correct? Why or why not?