Earthsci 1086 unit 2 - Study guides, Class notes & Summaries

What is the heliocentric model? - Answer - Sun is at the center of the Solar System What is the geocentric model? - Answer - Earth is at the center of the Solar System Define perihilon - Answer - The point of nearest approach of a planet to the Sun Define aphelion - Answer - The point of greatest separation How did Aristarchus contribute to the heliocentric model? - Answer - he experimented with placing Sun at the centre. Satisfied that the geometry seemed to work - and seemed able t...