[DOC] [TLE] Difference Between Geocentric and Heliocentric - Universe Today [PAR] Jan 23, 2015 ... What Is The Difference Between the Geocentric and Heliocentric Models of the 
Solar System? ... For example, Mars occasionally appeared to move backward 
with ... Ptolemy and others explained this using a system called epicycles, ... 
causes the North Pole star to change over time (which is now known as... [DOC] [TLE] Geocentric vs. Heliocentric Theory Comparison Study Sheet ... [PAR] The Heliocentric theory accounted for this observation by having the Earth spin 
on ... early as the 4th century BCE - recognized Polaris was not *exactly* at the 
pole. ... theory had to explain why the sky has some stars that move differently 
than ... the Sun, creating winter with the Sun appearing to move lower across the 
sky,... [DOC] [TLE] Geocentric model - Wikipedia [PAR] In astronomy, the Geocentric model is a superseded description of the universe 
with the Earth at the center. Under the geocentric model, the Sun, Moon, stars, 
and planets all circled ... First, the Sun appears to revolve around the Earth once 
per day. .... Stars, Motion of entire sky E to W in ~24 hrs ("first motion"), Stars: 
Daily... [DOC] [TLE] Copernicus and the Heliocentric Model - Teach Astronomy [PAR] scrollHeight) + "px"; } Copernicus and the Heliocentric ModelNicolaus ... sky 
could be explained if one assumed that Earth and other planets move ... over his 
book, Copernicus was not able to prove that the heliocentric model was correct. 
... Earth "overtakes" Mars on its interior orbit, Mars appears to temporarily reverse 
its... [DOC] [TLE] SDTV: Astronomy Transcript - PBS [PAR] The celestial sphere has poles in the same places as the Earth. ... When we look 
at the stars on the celestial sphere over a period of hours, they seem to .... 
Sometimes, the planets appear to move backwards in the sky. ... Aristarchus 
believed in a heliocentric universe, meaning that the sun was the center of the 
universe. [DOC] [TLE] What is retrograde motion? | Space | EarthSky [PAR] Nov 25, 2012 ... Sometimes the planets appear to change direction in the sky. This retrograde 
motion is entirely an illusion caused by the Earth passing the... [DOC] [TLE] Early Observations and Beliefs - Differing Scientific Theories, Years ... [PAR] He noticed that it appeared to move faster than the other planets, so he could 
chart its ... why Mars reversed directions as it moved across the sky. ... Unlike 
Tycho, Kepler firmly believed in Copernicus's theory about a heliocentric 
universe. ... passed Mars, which created the illusion that the red planet was 
moving backward. [DOC] [TLE] 1.1 The Motions of the Planets [PAR] Over the course of a night, the stars slide smoothly across the sky. ... Planets do 
not behave in as regular a fashion as do the Sun, Moon, and stars. ... and were 
geocentric, meaning that Earth lay at the center of the universe and all other ... 
Each time this happens, Mars appears to move backwards in the sky, in much the
... [DOC] [TLE] Celestial Sphere: The Apparent Motions of the Sun, Moon, Planets ... [PAR] Although heliocentric (Sun-centered) models of the universe were also ... as "
counter-intuitive" to the apparent motions of celestial bodies across the sky. ... 
periodic "backward" motion (retrograde motion) in the sky of the planets Mars, 
Jupiter, .... During the year, the moon and planets appear to move in a restricted 
region of... [DOC] [TLE] PART 2 - MOTIONS IN THE SKY - ASTRONOMY BY EYE [PAR] Objects can appear to move in the sky either because they are actually moving, ... 
We define a day to be the length of time it takes for the Sun to come back to the ... 
Because of the Earth's revolution, we see different stars during the night over the 
.... preferred an Earth-centered or geocentric universe because of the apparent... [DOC] [TLE] How We Came To Recognize The Sun As The Center Of Our Solar ... [PAR] Jan 24, 2015 ...

Question: This Pole's sun-centered universe theory explained why Mars appeared to move backwards across the sky
Answer: Copernicus