chapter 2 - Astronomy 100 Lecture Notes Chapter 2 Five...

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Astronomy 100 Lecture Notes Chapter 2 Five planets Greeks knew: Mercury, Venus, Mars, Jupiter and Saturn Geocentric cosmology: The Sun, the Moon the stars and the planets revolve around the Earth. Heliocentric cosmology: All planets including Earth revolve around the Sun. Direct (prograde) motion: When the planet moves to the east. Retrograde motion: Planets move from east to west. When retrograde motion happens, it is because Earth moves faster. (The retrograde motion of Mars) When Earth passes Mars, it is like when a train starts moving, and you are in the train, you see the view of another train goes backwards. Copernicus 1548: -Renaissance scholar who traveled through Europe. -Support Heliocentric -Published “De Revolutionibus” He determined which planets are closer to the Sun and which are farther away. Elongation: The angle between the Sun and a planet as viewed from Earth. If Mercury or Venus rises before the Sun, it is visible in the Eastern sky- Morning star.
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This note was uploaded on 01/27/2012 for the course CHEM 121 taught by Professor 1212 during the Spring '11 term at University of Illinois at Urbana–Champaign.

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chapter 2 - Astronomy 100 Lecture Notes Chapter 2 Five...

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