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Given a planet and a point $P$, is there an existing name for the angle $\theta$ as seen in the diagram below? If not, what would you call it? ("Angle of elevation"?)

Mystery angle diagram

Thanks!

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    I *think* you're asking about the "angular radius" of the planet, although a more commonly used concept is the "angular diameter".2012-06-14

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I think you want the "angular radius" of the planet, although people more commonly use the "angular diameter" instead.

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    @André, yes, I see your point now, distinguishing between lines to the poles and tangent lines. OP has drawn the line to the pole, whereas angular radius applies when instead one draws the tangent line. As you say, no practical difference when both numbers are small.2012-06-14