• .pdf file listing mileage among all state highpoints (16K)
• Excel file listing mileage with values (68K)
• Excel file with functions calculating the distance - requires NOAA Excel geographic add-on (223K)

• Indo for Calculating Straight Line
• NGS for Calculating Benchmarks in Radius

Sunrise/Sunset/Moon Calculations

• U.S. Naval Observatory

University of South Carolina site

Units Conversions

• Infoplease has a thorough explanation of conversion rates for everything from acres to yards.

Excel Spreadsheets to Calculate Distance

• NOAA has a great Excel spreadsheet that creates add-in geometic functions that make many distance calculations very easy.
• Pearson Software Consulting explanation of formulas for calculating distance.