The semi-major axis of the ellipse descibing the solar image. N1,N2 are the dimensions of the image. Units are pixels. The ellipse rotation angle. A counter-clockwise rotation of the y axis to the ellipse major axis is a positive angle.
Units are degrees.
1.0.LE.PCR.LE.1000.0 rot Rotation angle. A positive rotation angle corresponds to a counter-clockwise rotation of the input image in sky coordinates. Units are degrees. The output image header is copied from the input image header. The output image header contains the output limb ellipse parameters and the output pixel size parameters from the input parameters.