ISP 205 Lecture Notes - Lecture 4: Copernican Revolution, Geocentric Model, Deferent And Epicycle
29 Jan 2016
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Copernican revolution: grand path from the motion of planets to the science of motion. Ancient people of central africa (6500 bc) could predict seasons from the orientation of the crescent moon. Stonehenge in england (1550 bc): sun rises over the stone on the summer solstice. Believed to be the truth until 1630 ish. 2 types of objects: heavenly(sun, moon, etc) and base(earth like. Natural motion of heavenly objects is to move is to move in a circle at objects) constant speed. Natural motion of base objects is to be at rest. Followed aristotle"s principles: earth is at the center, earth does not move. Stars are on the celestial sphere, sphere turns around the earth once a day. The sun"s path is a circle, orbits earth once a day. Sun"s orbit moves a little each day with respect to the celestial sphere of the stars. Motion of the planets was the big unsolved problem for astronomy until 1630.
