Creates Halfspace from circle defined by two diametrically opposite points. If the two points are relative poles, then the whole sphere is returned.

Creates a halfspace from the center point and the cosine of the angle.

Creates a halfspace from center coordinates (RA,Dec) and radius.

Creates a halfspace whose edge goes through three specified points.

Creates a halfspace from the center point and the cosine and sine of the angle.

Creates a halfspace from the center point and the cosine of the angle.

Creates a halfspace from the center point (x,y,z) and the cosine and sine of the angle.