ASTR 1P01 Study Guide - Midterm Guide: Ecliptic, Celestial Pole, Celestial Equator

• School: Brock University
• Department: Astronomy
• Course: ASTR 1P01
• Professor: Bozidar Mitrovic

Document Summary

But one of the smaller bodies in the cosmic landscape. Inside earth over millions of years buckle planet"s crust = mountains & volcano"s. Motions deeper inside = magnetic forces that generate through the surface and into space these forces tug on needle of compass to show direction (n,s,w,e) Northern lights= magnetic forces in the atmosphere. Venus and mars show evidence of these same things! How ancients knew that the earth was round. Main: when standing on the shore of a lake or ocean, and there"s a sailboat approaching. As it gets closer you can see more and more of the sailboat: 4th bc aristotle made observations that we are definitely living on a sphere. For example: travel south and you see the stars and constellations that you could not see before. Therefore deduced that the earth must have spherical shape. Sun rises and in the east and sets in the west.