The simplest answer, probably, is "A point".
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longitude and latitdue
the exact location on the end of a ray is the endpoint
This is the definition of a "point" (dimensionless singularity; intersection of two lines or a line and a plane).
It is a point : the intersection of two or more straight lines, or of a line with a plane that does not include the entire line.
A point is not a circle. A point has no dimensions, it is a single, exact location in space. A circle is defined as the set of all points equidistant from some central point.