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<p>The <b>Hill sphere</b> is a common model for the calculation of a <a href="page.php?w=Sphere_of_influence_%28astrodynamics%29">gravitational sphere of influence</a>. It is the most commonly used model to calculate the spatial extent of gravitational influence of an <a href="page.php?w=astronomical_body">astronomical body</a> (m) in which it dominates over the gravitational influence of other bodies, particularly a <a href="page.php?w=Primary_%28astronomy%29">primary</a> (M). It is sometimes confused with other models of gravitational influence,</p><p>
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