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by: Sophie Stella

physnotesweek2.pdf PHYS 104-01

Sophie Stella

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Notes for week 2 of PHYS 104: Astronomy with Dr. Ruch
Dr. Ruch
Class Notes
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This 1 page Class Notes was uploaded by Sophie Stella on Tuesday February 23, 2016. The Class Notes belongs to PHYS 104-01 at University of St. Thomas taught by Dr. Ruch in Winter 2016. Since its upload, it has received 32 views. For similar materials see Astronomy in Astronomy at University of St. Thomas.


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Date Created: 02/23/16
PHYS 104: Astronomy Week 2 Course Notes, 2/8 – 2/12 Definitions 1A.U. (Astronomical Unit): The distance from the Earth to the sun. Perihelion: The closest point to the sun on an elliptical orbit. Aphelion: The furthest point from the sun on an elliptical orbit. Scientific Hypothesis: Aconjecture that must be falsifiable in order to be valid. Scientific Theory: Ahypothesis shown to be valid by experimental evidence. Epicycle: The retrograde motion of a planet orbiting something else from view on Earth. Geocentric: Having Earth at the center. Heliocentric: Having the sun at the center. II. Epicycles (circles within circles) A. Asmall circle which moves on the circumference of a larger circle, at whose center is Earth. B. Most medieval models of the solar system contained epicycles to explain the odd movement of planets. They hadn't yet figured out that these planets orbit the sun. Geocentric Model Heliocentric Model C. Retrograde motion When viewed from Earth, a planet whose orbit is outside Earth's, such as Mars, will appear to move backwards in the sky for a certain period of time before continuing its predicted motion. This is called retrograde motion, and occurs whenever Earth moves past a particular planet.


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