planetary motion By emilyjkoop Sep 18, 1000 equinoxs- khufu Period: Sep 18, 1000 to Sep 18, 2000 planitary motion Sep 18, 1530 heliocentric descovered by Nichaus Comrnicus Sep 18, 1600 teliscope desoverd moon moutians- galileo Galileo Sep 18, 1700 johannes kelper- ellips not circles Sep 18, 2000 geocentric descoverd by Aristosle