Spherical Trigonometry

Some downloads of technical (text) info in pdf format:

Spherical Trig Basics

Spherical Trig  -Mathworld

Spherical Trig Formulae

Haversine Formulae

Download a Mathcad file of some sample spherical problems.

View these same spherical problems in HTML format.

Download the Athens - Sao Paulo Solution (pdf format)

Download SPHERE, a zipped VB program that calculates the great circle distance between any two locations on a globe. This program will have to be downloaded, extracted, and installed.

A file of 120 cities' longitude and latitude are available to be loaded into Sphere. Right click on this link:  SphereCityList.scl and select (left click on) "Save Target As... " to download this file to the folder of your choice on you computer. After the SPHERE program is running, you can click on Options on the menu  and then select Load City List. Open the file and SPHERE will automatically incorporate the file's data for use in SPHERE. See the picture below: