determined the size and shape of the Milky Way Galaxy developed and published the Universal Laws of Gravitation in his Principia - proving why orbits are ellipses studied the motions of objects, and using the first astronomical telescope, observed that not everything revolved around the Earth proved planets follow elliptical orbits around the Sun and wrote the three Laws of Planetary Motion proposed a Sun-centered universe to replace the old Earth-centred universe put forth by ancient astronomers like Ptolemy It was people like the following that really figured out where Earth fits in the Universe and how it moves: Long ago, people thought the Earth was the stationary centre of the Universe and everything else moved around it. Interested in Astronomy? Become a member of the RASC!Ĭlick here to find out about RASC membership and RASC publications.ĭo you think you are motionless as you sit at your computer reading this page? The RASC Calgary Centre - How Fast Are We Moving?
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