Kepler's laws


pl n

three laws of planetary motion published by Johannes Kepler between 1609 and 1619. The first states that the orbit of a planet describes an ellipse with the sun at one focus. The second states that, during one orbit, the straight line joining the sun and a planet sweeps out equal areas in equal times. The third states that the squares of the periods of any two planets are proportional to the cubes of their orbital major axes

QUIZZES

A THANKSGIVING SPELLING QUIZ TO FEED YOUR HISTORY KNOWHOW

Before you celebrate family and blessings this year, take this quiz to test your spelling knowledge of the history and important figures of the first Thanksgiving.
Question 1 of 7
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012