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Astronomy_HorizonFromVector is a specialized variant of
Astronomy_SphereFromVector that flips the orientation of the
azimuth angle to the more traditional clockwise-from-north
direction used in navigation and cartography.
It also allows the same optional refraction correction as
Astronomy_Horizon.
Astronomy_Rotation_EQD_HOR converts a equatorial-of-date vector
to a horizontal vector. The horizontal vector has the following
components:
x = North
y = West
z = Zenith
Removed trailing whitespace in generate.c.