What does Copnericus, Netwon, and Ptolemy contribute to the Geocentric vs. Heliocentric theory????? Please help. I've already researched Brahe, Halley and Kepler.

Answer 1

http://www.vibrationdata.com/space/helio.html

http://www2.astro.psu.edu/users/rbc/a1/lec4n.html