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I get 4.01028° using the Wiki approximates.
You need to think in all dimensions - if you look at it as a flat trig equation, it only works for 1/4 of the picture. Breaking it down into a singular right angle triangle, the "diameter" (opposite "radius") is 3500 l.y.
So, tan-1(3500/200000) is 1.002°. Now, if we simplistically expand that to 4 right angle triangles of x,y, -x, -y, you get 4.01028°.
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