Angle may be different near to horizon because of refraction! Horizontal Mode: mark start,end: distance/position angle in alt/azimuthal coordinates, line stays fixed in alt-az system. Note Georg Zotti extended in 2014-09, enough to call it V4.0Įquatorial Mode (original): mark start,end: distance/position angle in the sky, line rotates with sky, spherical angles influenced by refraction (numbers given on celestial sphere). The observatory lab had some old scopes set up at one end, pointing at a photograph of Saturn at the other end of the lab. It was not the high academic glamor one might expect. Goes misty eyed* I recall measuring the size of the Cassini Division when I was a student. ![]() The Angle Measure plugin is a small tool which is used to measure the angular distance between two points on the sky. Main window of the Angle Measure plug-in.
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