History of Astronomy Timeline Activity
ICPE
Name __________________
Date ____________
1.)Aristotle (384 - 322 BC) - Earth was round (Curved shadows, believed Geocentricsystem)
2.) Aristarchus (312 - 230 BC) - Believed in Sun-centered solar system
(Heliocentric)* Most Greeks believed in geocentric solar system.
3.) Eratosthenes (276 - 194 BC) - Calculated the circ. Of the Earth
4.) Hipparchus (170 - 100 BC) - star brightness, length of year, eclipses
5.) Ptolemy (141 AD)- Heliocentric, epicycles showing retrograde motion
Dark Ages 6.) Nicolaus Copernicus (1473 - 1543 AD) - Sun centered, Perfect circle orbits,
Scared. topublish until on death bed.
7.) Tycho Brahe (1546 - 1601 AD) - build angle device, plotted stars and planets,
hired Kepler as an asst.
8.) Johannes Kepler (1571 - 1630) - planets in ellipses, variable speeds, Laws of
Planetary Motion
9.) Galileo Galilei ( 1564 - 1642) Telescope, Phases of Venus, Moons of Jupiter,
Church
10.) Issac Newton (1642 - 1727) - Law of Universal gravitation, Laws of Motion
(Mathematics)