| definition |
- Helioprojective Radial - A 3-D orthonormal (left-handed) coordinate system that is primarily
intended to specify with two dimensions a point on the solar disk. The Z axis points from the
observer to the center of the solar disk. The Y axis lies in the plane defined by the solar spin
vector and the Z axis, positive northward. The X axis is perpendicular to the Y and Z axes,
positive toward solar west. Given as the distance between the observer and the center of the
solar disk, the standard representation for this system of an (x,y) point on the solar disk is via
the point's latitude angle theta {= arctan [SQRT(x**2 + y**2)]/d]} or equivalent declination
parameter delta (= theta - 90 deg), and its phase angle psi as measured counter- clockwise from
the +Y axis [psi = arctan (-y/x)].
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