01:750:109 Lecture Notes - Lecture 11: Geocentric Model, Astrological Sign, Retrograde And Prograde Motion
19 Oct 2018
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Document Summary
Geocentric model - what we see would be best described by the earth being at the center of the universe. Circular motions until heaven (beyond position of stars) Heliocentric model - sun at center, earth and planets going around sun (even an option in. Why a geocentric model makes sense in context. Orion - cannot see nowadays in summer (4 am) Can see orion in winter (9pm ish) 6 months later, sun and orion in the part of the celestial sphere corresponding to orion. All this info is in the picture. Planets not far from ecliptic and did not appear on the drawings. Always was a problem to figure out where they would be. Parallax - the apparent displacement, or difference of position, of an object, as seen from two different station, or point of view. Things appear to be in different places. Relation between how close the object is and how much it changes in position when we move.
