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# Semi-Major Axis using `mu & P`

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Equation / Last modified by Administrator on 2015/06/09 07:14
`a = `

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vCalc.Semi-Major Axis using `mu & P`

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15a3d93a-08e8-11e4-b7aa-bc764e2038f2

This equation computes the semi-major axis, `a,` from the period of the elliptical orbit and the Earth Gravitational Constant, `mu`.

# Notes

The semi-major axis, `a`, is the distance between the ellipse center and the apogee point.

This equation,

**Semi-Major Axis using `mu & P`**, references 2 equations/constants.**Equations and Constants **