Aristotle Aristarchus 384-322 BCE ~310-230 BCE planets sun planets earth earth sun Drawing of model Drawing of model Geo-centric Helio-centric Earth is the center of all things Moon, sun, planets, and stars are on a series of circles surrounding earth Reasoned that earth could not go around sun because if it did, the stars would change (parallax) Solar system is sun-centered … Beliefs Beliefs TEACHER NOTES below Materials per student: sheet of copy paper, colored pencils (optional) Simple teacher notes: After students fold their paper into thirds (making 3 columns on front and 3 on the back) have them follow the template we establish for Aristotle and do the others the same way. Other Notes Teachers- make one of these for yourself beforehand; that will help you explain things better, plus you have an example to show students. If your book does not cover all 6 ancient astronomers, no big deal; just do 4 or 5 and leave the last one blank. Change as much of the text on the ppt as you like. If your students finish early, adding color would be a nice touch. Could be as simple lightly shading each different column a different color. How I finished the other astronomers: Aristarchus: (helio-centric) solar system is sun-centered; attempted to measure distances to the moon and sun. Was incorrect, but that began mathematical interest in astronomy Ptolemy: (geo-) celestial bodies travel at constant speeds and in perfect circles; the planets moved on small circles that in turn moved on larger circles Copernicus: (helio-) adopted Ptolemy’s ideas of planetary circles and “wheels on wheels”; put the sun at the center! Kepler: (helio-) realized that planets did not travel in perfect circles; stated 3 principles relating to planetary motion Galileo: (helio-) observed celestial objects with the telescope; discovered that earth was not the only body orbited, and venus goes around the sun; proved heliocentric model Now you finish the others the same way