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1 vote

Celestial Coordinates and Sun's degrees below horizon

The vernal equinox is defined as the time the Sun's DEC changes from south to north. At that time the Sun is directly over some point on the equator. If it's 2;30 on your watch and you happen to be in ...
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1 vote

Measure the deprojected distance between two points?

My eventual solution was to rotate the image using the 2D rotation matrix, then deproject by accounting for the inclination. In Python, this looks like: ...
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3 votes

Measure the deprojected distance between two points?

@Greg Miller's point is that the rotation angle doesn't count. The only measurement you care about is the inclination. It makes a point's arc distance from the major axis of the apparent ellipse cos(...
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