a: Ellipse major Axis
b: Ellipse minor Axis
az: Azimuth of the satellite
<j>: The major angle of the ellipse
(x,. y.,) the point on the ellipse at the minimum distance between the ellipse and the satellite (Xj, y2) the point an the ellipse at the maximum distance between the ellips and the satellite d,: The distance between the boundary of the ellipse closest to the satellite and the satellite dj: The distance betoveen the boundary of the ellipse farthest from the satellite and the satellite d3=(d2-d,)/2 d4=d1 + d3)
