Category:Definitions/Apsides

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This category contains definitions related to Apsides.
Related results can be found in Category:Apsides.


Let $A$ be a body in orbit $O$ around another body $B$.

Let $\mathbf r$ be the radius of $O$.

An apsis is a point on $O$ at which:

the rate of change of the length of $\mathbf r$ is zero

and:

the velocity of $A$ is perpendicular to $\mathbf r$.