= Spatial Algorithm Web Sites =


 * http://geospatialmethods.org/spheres/
 * http://planetmath.org/encyclopedia/AreaOfASphericalTriangle.html
 * !PgAstro includes !PgSphere, has Area on a Shere calculation, http://www.pgastro.org/doc/html/index.html
 * http://trs-new.jpl.nasa.gov/dspace/handle/2014/40409?mode=full&submit_simple=Show+full+item+record Area on a sphere algorithm