Editing Circular orbit (section)

==Velocity==
The speed (or the magnitude of velocity) relative to the centre of mass is constant:<ref name=lissauer2019>{{Cite book |title=Fundamental Planetary Sciences : physics, chemistry, and habitability |last1=Lissauer|first1=Jack J. |last2=de Pater|first2=Imke |year=2019 |publisher=Cambridge University Press |isbn=9781108411981 |location=New York, NY, USA |pages=604 }}</ref>{{rp|30}}
:<math> v = \sqrt{ GM\! \over{r}} = \sqrt{\mu\over{r}} </math>
where:
* <math>G</math>, is the [[gravitational constant]]
* <math>M</math>, is the [[mass]] of both orbiting bodies <math>(M_1+M_2)</math>, although in common practice, if the greater mass is significantly larger, the lesser mass is often neglected, with minimal change in the result.
*<math> \mu = GM </math>, is the [[standard gravitational parameter]].
*<math>r</math> is the distance from the center of mass.