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Solar Calculations

Solar Calculations are useful for predicting solar events, designing sundials and also in architectural design.  The sun's motion is now predictable to high degrees of accuracy using astronomical models and the calculating power of modern PCs.

Tables of solar calculations (e.g. Equation of Time, Declination) for various times are called ephemerides (ephemeris).

Calculate!

The Sun API is designed to make solar calculations in your programs fast and convenient.  It works with any programming or CAD environment that can utilise functions in a DLL.

Using Excel Spreadsheet with The Sun API is a convenient way to calculate your own ephemeris tables.