the Analemma

the Analemma:

Solar angle and duration calculations are harder then they appear, not only lat/long required, but the earth is tiled, the earth's orbit is elliptical and at different points in that ellipse the earth is moving faster at perihelion and slower at aphelion. This is only an 8 second difference, but if you are going to understand and do it- why not attempt to get it right?


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