[lemma=kepler | lemma=□] □
[lemma=kepler | lemma=be] □
[lemma=kepler | lemma=kepler] □
However , it is 's helpful to know you are deviating from your plans so that changes can happen in a deliberate and thoughtful way . Kepler 's new astronomy was , indeed , founded on circles , but there was a different reason for this , as we shall explain in Section 5 . Kepler 's second law can be visualized like this . With a novelist 's talent for the details that keep readers reading late , Maor tells the stories of how Kepler 's misguided theology led him to the laws of planetary motion ; of obscure Jeremiah Horrocks , who predicted the 1639 transit only to die , at age 22 , a day before he was to discuss the event with the only other human known to have seen it ; of the unfortunate Le Gentil , whose decade of labor was rewarded with obscuring clouds , shipwreck , and the plundering of his estate by relatives who prematurely declared him dead ; of David Rittenhouse , Father of American Astronomy , who was overcome by the 1769 transit 's onset and failed to record its beginning ; and of Maximilian Hell , whose good name long suffered from the perusal of his transit notes by a color-blind critic . Kepler 's official duties included preparation of ephemerides and calendars , involving weather predictions and astrological notes . Can you help me on what measurement it is that I need to prove Kepler 's second law . This is Kepler 's second law . You get v_theta from angular momentum ( Kepler 's second law ) . Furthermore , by Kepler 's second law of planetary motion , Earth moves a bit faster when it is closer to the Sun .