Locate a Point on the Earth's Surface
Move the red cursor and click to select the position under it. This shows a selected location on the Earth's surface. The panel at the bottom reports the latitude and longitude of the selected position. Use the sliders to rotate the globe and to zoom in.
The code for this Demonstration makes uses of an approach to computing the intersection of a line and a sphere that is provided by .
The image used to texture the globe is from NASA .
Snapshot 1: near the South Pole
Snapshot 2: zoomed in near Atlanta, Georgia, USA
Snapshot 3: near Auckland, New Zealand
 AmBrSoft. "Intersection of a Line and a Sphere." (Mar 15, 2017) www.ambrsoft.com/TrigoCalc/Sphere/SpherLineIntersection_.htm.
 NASA Earth Observatory. (Mar 15, 2017) eoimages.gsfc.nasa.gov/images/imagerecords/57000/57752/land_shallow_topo _ 2048.tif.