Motions of the Planets

Motions of the Planets - Motions of the Planets o o o Solar...

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Motions of the Planets o Solar System Models and Gravity o Earth is the center of everything o Geocentric Model - Aristotle build a geocentric mod el used for centuries. - Ptolomy built a m ath e m atical mod el of the solar syste m. o Retrograd e Motion of Mars 2003 – prograd e moving backward o Geocentric Model used for 1200 ye ars - Earth’s still the center o Copernicus - Believed that the geocentric m od el shown motions that were to complicated to be re - Geocentric mod el does not explain retrograd e motion - Built the first m ath e m atical heliocentric syste m (Sun’s the center) o Heliocentric Model (Inferior and superior plan ets) o Inferior Planets – Planets lies within e arth’s orbit (Inferior – close to us)
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Superior Planets – planets that  - Opposition – sun on one side, planets on the other – planet highest in the sky at midn - Conjunction – planet and sun on the same side – planet highest in the sky at noon
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- Simple Explanation for Retrograde Motion  Eastern Elongation – planet farther east than the sun - If Venus is the greatest eastern elongation to the sun, Venus would be the evening st Copernicus insisted that the heavens were prefect, therefore the planets moved in perfect c   orbits about the Sun - Shown simple explanation for retrograde - Failed to explain why planets move faster across the sky at particular locations along   orbits - Ended up adding epicycles as correction  Galileo Galilei  - First to built astronomical telescope – used object from spying glass and readjust it
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Motions of the Planets - Motions of the Planets o o o Solar...

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