AST101H5 Lecture Notes - Lecture 6: Aswan, Scientific Method, Deferent And Epicycle
Document Summary
Look for trends (hours of daylight change with seasons) Look for exceptions (eclipses do not occur every month) (would occur every month if moon was titled at 0 degrees) Trust our brains from observing to understanding. The(cid:455) had a (cid:373)e(cid:374)tal (cid:373)odel (cid:894)idea/i(cid:373)agi(cid:374)atio(cid:374) of this whi(cid:272)h (cid:272)a(cid:374)"t (cid:271)e ph(cid:455)si(cid:272)all(cid:455) e(cid:454)plored(cid:895) Observed evidence to work with (lunar eclipses are always curved = earth is a sphere) Travelled to africa and saw unfamiliar stars/position in sky was different (concluded earth is not flat) Observed the sun from two different locations and measured the angle (7 degrees) Measured the distance from alexandria to syene and found the radius of the earth (refer to formula) We observe sun moons and planets rising and setting but feel no motion. Earth is motionless and everything else orbits around us = geocentric model (developed by ptolemy) Every planet has a large orbit (deferent) around earth.
