Quiz 3

Sites used tonight:

 

http://scaleofuniverse.com/

http://xkcd.com/482/

http://astro.unl.edu/classaction/animations/renaissance/kepler.html

 

http://www.physics.sjsu.edu/tomley/Kepler12.html

 

http://www.youtube.com/watch?v=8yCzzTkDSMo

 

http://www.stumbleupon.com/su/2jRGYC/dd.dynamicdiagrams.com/wp-content/uploads/2011/01/orrery_2006.swf/

 

Quiz 3

 

Kepler's laws:

 

1.  Elliptical orbits

2.  Equal areas in equal times - and how the speed varies with the planet's position in its orbit

3.  a cubed = P squared.  The semi-major axis of orbit (cubed) is equal to the time around the Sun (squared), as long as you choose appropriate units (a is in AU - astronomical units; P is in Earth years)

 

Rough chronology:

 

Ptolemy

Copernicus

Tycho

Kepler / Galileo

Newton

 

Review the websites above if time allows.