# Circular Orbit Velocity using mu

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V_"cs" =
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vCalc.Circular Orbit Velocity using mu
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This equation computes the escape velocity, V_"cs" for a satellite in a circular orbit given the orbit radius, r.

This is assuming a spherical Earth model and uses the fact that for a circular orbit the semi-major axis equals the radius of the orbit, which is constant.

V_"cs"= (mu/r)^(1/2)

# Notes

For many analyses the spherical Earth approximation is adequate.  See the WGS-84 constants to see the variations in Earth models.

Note that the orbit's radius, r, must be greater than the radius of the Earth R_e or else we would be hearing a very strange rumbling beneath or feet.

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