This component computes the solar declination, which is the angle between the equatorial plane and the solar beam. The input signal nDay is the one-based number of the day, but in seconds. Hence, during January 1, we should have nDay = 86400 seconds. Since the effect of using a continuous number rather than an integer is small, we approximate this so that nDay = 0 at the start of January 1, and nDay = 86400 at the end of January 1.


A validation with a more detailed calculation can be found at Buildings.BoundaryConditions.SolarGeometry.BaseClasses.Examples.Declination.


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