Differences

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+====== Sun ======
+  Streefkerk:   lat=51.90, lon=4.75
+  Winter = UTC+1, Zomer=UTC+2
+{{::solarcalcs.pdf |Formules}}
+===== Sun declination =====
+  sin δ = 0.39795 ⋅ cos [ 0.98563 ⋅ ( N – 173 ) ]
+  δ: declination [rad]
+  N: days since 1 jan
+  accuracy: +/- 1 deg
+===== Elevation =====
+[[http://solardat.uoregon.edu/SunChartProgram.html|graph]]

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