Calculates the solar angular radius as seen by the observer.

The tangent vector from the observer to the edge of the Sun forms a right-angle triangle with the radius of the Sun as the far side and the Sun-observer distance as the hypotenuse. Thus, the sine of the angular radius of the Sun is ratio of these two distances.


coordinates (SkyCoord, Helioprojective) – The input coordinate. The coordinate frame must be Helioprojective.


angle (Quantity) – The solar angular radius.