Kepler's Second Law http://www.phy6.org/stargaze/Skepl2nd.htm http://www.phy6.org/stargaze/Skepl2nd.htm http://www.phy6.org/stargaze/Skepl2nd.htm http://www.phy6.org/stargaze/Skepl2nd.htm planets of the solar system--#7 http://www.phy6.org/stargaze/Skepl2nd.htm http://www.phy6.org/stargaze/Skepl2nd.htm http://www.phy6.org/stargaze/Skepl2nd.htm http://www.phy6.org/stargaze/Skepl2nd.htm