May 212013
 
http://www.cpearson.com/excel/LatLong.aspx

Latitude, Longitude,
And Great Circles

This page describes how to work with Latitude and Longitude in Excel and how to compute Great Circle Distances.
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Introduction

You can use Excel’s trigonometric and time functions to work with Latitude and Longitude values. There are two different ways express geographical coordinates. The first is to use a time format of degrees:minutes:seconds. This is the same format as an Excel time value. The other method is to use decimal degrees, representing values as the number of degrees as a real number. For example, the location 20 degrees, 30 minutes, 40 seconds can be represented as the time 20:30:40 or in decimal degrees as 20.51111.

download You can download the file with all the example formulas and code on this page.
 Posted by at 5:20 am

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