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<p>Comparing these formulae shows that  corresponds to an ellipse (all solutions which are <a href="page.php?w=orbit_%28dynamics%29">closed orbits</a> are ellipses),  corresponds to a <a href="page.php?w=parabola">parabola</a>, and  corresponds to a <a href="page.php?w=hyperbola">hyperbola</a>.  In particular,  for perfectly <a href="page.php?w=circle">circular</a> orbits (the central force exactly equals the <a href="page.php?w=centripetal_force">centripetal force requirement</a>, which determines the required angular velocity for a</p><p>
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