AST-1A Lecture 4: Ast_1-A_Day_4
Document Summary
Guest stars those that are normally too faint to see but suddenly flare up to become visible to the unaided eye for a few weeks or months. The polynesians learned to navigate by the stars over hundreds of kilometers of open ocean a skill that enabled them to colonize new islands far away from where they began. In britain, before writing ancient people used stones to keep track of the motions of the sun and moon. Cosmology our concept of the cosmos, its basic structure and origin. At least 2000 years before columbus, educated people in the eastern mediterranean region knew earth was round. Pythagoras believed circles and sphere to be perfect forms and suggested that. The writing of aristotle described how the progression of the moon"s phases it"s apparent changing shape results from seeing different portions of the moon"s sunlit hemisphere as the month goes by.
