Ptolemy - Egyptian Philosopher who developed the idea of a GEOCENTRIC (Earth centred) Universe using planetary observations made by Greek astronomer Hipparchus.
Nicolaus Copernicus - developed the first HELIOCENTRIC (sun centred) model of the universe. At that time = Earth, Moon, Sun, Five Planets and the Fixed Stars
He suggests that the Earth, abd planets orbit the sun unlike previously thought.
Copernicus explained the occasional retrograde movement of Mars, Jupiter and Saturn. By placing the sun at the centre of the universe he explained this as Earth "overtaking the outer planets on the inside" as it moved faster in its orbit.
Tycho continued the study into the heliocentric model from his observatory until his death in 1601. Kepler used Tycho's study of Mars to formulate his LAWS OF PLANETARY MOTION.
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