NATS 1745 Study Guide - Final Guide: Geographical Pole, Semi-Major And Semi-Minor Axes, Orbital Speed
20 May 2016
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Tycho"s lifelong goal is to find the correct model of the universe. He witnessed a planetary conjunction of jupiter, saturn and venus. He found the plotemy and cornopolius model was inaccurate in predicting this event. It motivated him to find the correct model of the universe: what discovery did tycho make about the supernova of 1572, and how did it contradict. He found: the coordinates of the 1572 supernovae (tycho"s star) remained fixed relative to other stars. Describe (briefly) how it should effect our view of the stars. Parallax is the perceived shift of an object relative to its background due to the motion of the observer. For a nearby star, it should change the background of the star, and show a perceived shift around its background. He did not detect stellar parallax using his measurements, which inferred the stars were at least 7000 au away, meaning the closest star would be 700x larger than saturn.
