Two points are antipodal (i.e., each is the Antipode of the other) if they are diametrically opposite. Examples include endpoints of a Line Segment, or poles of a Sphere. Given a point on a Sphere with Latitude and Longitude , the antipodal point has Latitude and Longitude (where the sign is taken so that the result is between and ).
See also Antipode, Diameter, Great Circle, Sphere