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I am not familiar with spherical geometry. I am working with elliptical polarization that involves using poincare sphere that present the latitude and longitude angle in spherical geometry. I need to find the great circle angle if given two points that each specified by their longitude angle [itex] 2\tau[/itex] and latitude angle [itex] 2\chi[/itex].

ie. If I am given the [itex] \chi [/itex] and [itex]\tau[/itex] of [itex]M_{1}(\tau_{1},\chi_{1})[/itex] and [itex]M_{2}(\tau_{2},\chi_{2})[/itex], how can I find the great circle angle between [itex]M_{1}(\tau_{1},\chi_{1})[/itex] and [itex]M_{2}(\tau_{2},\chi_{2})[/itex]?

I really don't want to learn the details of spherical geometry, just want to learn the way of finding the angle as this is only a small part of antenna design.

Thanks

Alan

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# How to find an angle in spherical geometry.

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