Lecture4 - An unusual hexagonal cloud system surrounds...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
An unusual hexagonal cloud system surrounds Saturn's north pole
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Homework #1 is now available on both the A105 website and the Oncourse Original Test and Survey utility. Answers are due no later than Thurs. January 26, 5:00 pm. Work through the questions from the class website and have answers in place before you input them via Original Test and Survey.
Background image of page 2
Patterns observed in sky (partial list) Stars rise in east, set in west Sun rises in east, sets in west Planets rise in east, set in west Moon rises in east, sets in west Sun moves ~ 1 degree/day eastward relative to stars. Rising/setting points of Sun cyclically move north and south during year Sun repeats its path through stars each year (Ecliptic) Planets always found near the Ecliptic Planets usually move eastward relative to stars Some planets occasionally reverse this motion Mercury and Venus (inferior planets) are always close to the Sun in sky anywhere along the Ecliptic relative to the Sun.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Observed: Patterns are seen in the locations and motions of stars, sun, moon, and planets in the sky Question: What causes these patterns Hypothesis: Develop a model Test: Test the model
Background image of page 4
Claudius Ptolemy (100-170 CE) Developed a “geocentric” model of the universe designed to fit the observational data. Ptolemy and later scientists were strongly influenced by the belief of Plato that … “all natural motion is circular”
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Although the geocentric model of Ptolemy gained dominance, Aristarchus of Samos actually proposed that the earth rotated daily and revolved around the sun
Background image of page 6
deferent Solution:  Planet moves at a  constant rate around epicycle,  while the center of the 
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 39

Lecture4 - An unusual hexagonal cloud system surrounds...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online