Good basic activity comparing and contrasting the two models. Lesson plans; worksheets; PowerPoint programs and more can be found in the AstronomyDad store.Terms/names/concepts may include:Ptolemy Copernicus Tycho Brahe Johannes Kepler Galileo Galilei Aristarchus Isaac NewtonStonehenge Celestial sphere, firmament Geocentric, heliocentric Altitude, azimuth, zenith Deferent, epicycle, eccentric N / S celestial pole, celestial equator Retrograde (motion) Polaris, Pole Star, North Star Circumpolar