- Astronomical Units
One Astronomical Unit is the distance from the Sun's center to the Earth's center. It is equal to 149,600,000 km (93,000,000 miles).
http://www.windows.ucar.edu/tour/link=/space_missions/au.html&INPUT_STRING=Kepler&SEARCH_TYPE=phrase&USER_LEVEL=mid&edu=high
(Added: Sat Oct 26 2002)
- Java Applet for Kepler's Second Law
This is an interactive page that will allow users the investigate Kepler's second law.
http://www.phy.syr.edu/courses/CCD_NEW/seti/tutorial/java.html
(Added: Sun Oct 27 2002)
- Johannes Kepler
Johannes Kepler (1571-1630) was an Austrian mathematician and astronomer who got himself taken on as an assistant to Brahe in order to get access to his planetary tables. This page is part of Eric Weisstein's World of Scientific Biography.
http://scienceworld.wolfram.com/biography/Kepler.html
(Added: Sun Oct 27 2002)
- Johannes Kepler
This web site offers and excellent biography of Johannes Kepler.
http://es.rice.edu/ES/humsoc/Galileo/People/kepler.html
(Added: Sun Oct 27 2002)
- Johannes Kepler
Johan Kepler was a German astronomer who lived between 1571-1630. He introduced three important laws of planetary motion and helped the Copernican model of the solar system gain general acceptance.
http://www.windows.ucar.edu/tour/link=/people/ren_epoch/kepler.html&SEARCH_TYPE=phrase&USER_LEVEL=mid&INPUT_STRING=Kepler&SEARCH_DIR=&back=/search/search_navigation.html&edu=mid
(Added: Sat Oct 26 2002)
- Johannes Kepler: The Laws of Planetary Motion
Kepler was forced to the realization that the orbits of the planets were not the circles demanded by Aristotle and assumed implicitly by Copernicus, but were instead the "flattened circles" that geometers call ellipses.
http://csep10.phys.utk.edu/astr161/lect/history/kepler.html
(Added: Sun Oct 27 2002)
- Kepler's First Law
With Tycho Brahe's observations in hand, Kepler set out to determine if the paths of the planets against the background stars could be described with a curve. By trial and error, he discovered that an ellipse with the Sun at one focus could accurately describe the orbit of a planet about the Sun.
http://www.windows.ucar.edu/tour/link=/the_universe/uts/kepler1.html&INPUT_STRING=Kepler&SEARCH_TYPE=phrase&USER_LEVEL=mid&edu=high
(Added: Sun Oct 27 2002)
- Kepler's Laws
Describes Kepler's laws, offers animation and mathematical details regarding the laws and provides a biography of the astronomer.
http://home.cvc.org/science/kepler.htm
(Added: Sun Oct 27 2002)
- Kepler's Laws
A short list of Kepler's laws from Eric Weisstein's World of Physics.
http://scienceworld.wolfram.com/physics/KeplersLaws.html
(Added: Sun Oct 27 2002)
- Kepler's Laws of Planetary Motion
Read explanations of Kepler's laws of motion and watch videos of how his solar system moves. Also see how Ptolemy had set up his system.
http://zebu.uoregon.edu/textbook/planets.html
(Added: Sun Oct 27 2002)
- Kepler's Second Law
Kepler's second law he again discovered by trial and error. After some experimentation, Kepler realized that the line connecting the planet and the Sun sweeps out equal area in equal time.
http://www.windows.ucar.edu/tour/link=/the_universe/uts/kepler2.html&INPUT_STRING=Kepler&SEARCH_TYPE=phrase&USER_LEVEL=mid&edu=high
(Added: Sun Oct 27 2002)
- Kepler's Third Law
Kepler's 3rd law is a mathematical formula. It means that if you know the period of a planet's orbit (P = how long it takes the planet to go around the Sun), then you can determine that planet's distance from the sun (a = the semimajor axis of the planet's orbit).
http://www.windows.ucar.edu/tour/link=/the_universe/uts/kepler3.html&INPUT_STRING=Kepler&SEARCH_TYPE=phrase&USER_LEVEL=mid&edu=high
(Added: Sun Oct 27 2002)
- Kepler's Third Law Applet
This applet shows the relative orbits of Earth and Mars as governed by Kepler's Laws. The purpose of the applet is to demonstrate why it takes approximately 2 years for a manned mission to Mars.
http://jersey.uoregon.edu/vlab/kepler/Kepler.html
(Added: Sun Oct 27 2002)
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