Calculate semi-major axis (mean value of the maximum and minimum distances of ellipse) from astronomy calculator by using maximum, minimum distances of the ellipse from a focus.
Formula:
where,
rmax = maximum distance of the ellipse from a focus
rmin = minimum distance of the ellipse from a focus
a = semi-major axis
rmax = maximum distance of the ellipse from a focus
rmin = minimum distance of the ellipse from a focus
a = semi-major axis