Stand at any given point on the surface world, and measure the angle above the horizon of some celestial object. Pole Star is convenient, for a number of reasons. Call this angle 'A'. Now take the same measurement 'd' Key Miles directly towards that object, and call this angle 'B'.
Then the Pole Star is at height: d (sin A) (sin B) / sin (B - A) km.
If one has access to a baseline of, say, 1000km, then you can detect parallax of objects up to maybe 100,000km away (with rapidly decreasing accuracy).
Yes, this is point-headed, and non-hipster-cool (thank ghod). Let's not forget that Glorantha has its pointy-heads too, though.
Slainte,
Alex.
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