Calculating Distances Between Two Cities   Online Calculator   FREE Distance Calculation Scripts - C++ - Java - Perl - Php

CALCULATING DISTANCES BETWEEN TWO CITIES

Astronomy Answers: Great Circles

Calculating Distances Between Two Points (from the Australian Government)

Latitude/Longitude, NCGIA (by Kirvan, Anthony P., 1997),
Core Curriculum in GIScience

GIS FAQ Q5.1: Great circle distance between 2 points

Using great circles to understand motion on a rotating sphere

Spherical Trigonometry Related to Distance Computation

Aviation Formulary (by Ed Williams)

Geographic Co-ordinates

Mapping the Sphere

Great Circle explanation (from Matwworld)

Great Circle Distance explanation (from answers.com)

Calculating daylight hours by date and latitude (from mathforum)

Find All Cities (Using latitude and Longitude), x miles off a straight line between two cities (from mathforum)

How did Eratosthenes measure the circumference of the earth? (from mathforum)

Rhumb Lines and Great Circle Routes (from mathforum)

The Deluge and Geodesy – An historical review to distance calculation

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ONLINE CALCULATOR

How Far Is It (by indo.com)

Great Circle Calculator (by U.S. Geological Survey)

Spreadsheets to calculate Great Circle distances (by andrew-gray.com)

Latitude/Longitude Distance Calculation page (by Chris Michels)

Search for latitude and longitude data by entering a zip code or town
and state information (from the Bureau of the Census Gazetteer)

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FREE DISTANCE CALCULATION SCRIPTS

C++
Geographic Distance and Azimuth Calculations (by Andy McGovern)

Java
Bearing and Distance calculations (from Bowditch's Practical Navigator)

Php
Geographic Distance and Azimuth Calculations
(by Steven Brendtro of www.imaginerc.com)

Perl
Great-circle distance between two points on earth's surface
(by Darrell Kindred)

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