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In an equilateral trianger, each angle is 60 degrees. In all triangles, including equilateral triangles, all 3 angles add up to 180 degrees.(the above assumes Euclidean - flat - space. In Hyperbolic space there are less than 180° in all triangles; in Spherical space more than 180° in all triangles)
Not sure how much the sun moves through space - about the centre of the Milky Way Galaxy. The earth rotates through 0.25 degrees in a minute so the sun APPEARS to move 0.25 degrees.
An angle.
None. A degree is a measure of angular separation in 1-dimensional space, a steradian is a measure in 2-dimensional space. It makes no sense to try to convert from one to the other.
30 degrees.