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+
+; http://hyperphysics.phy-astr.gsu.edu/hbase/atmos/blusky.html#c1
+
+(var N "number of scatterers")
+(var alpha "polarizability")
+(var R "distance from scatterer")
+(var I_0 "original intensity")
+(var I "scattered intensity")
+(var lambda "wavelength of light")
+(var Theta "angle of scattering")
+
+(eq I
+ (* I_0
+ (/ (* 8 (exp pi 4) N (exp alpha 2))
+ (* (exp lambda 4) (exp R 2)))
+ (+ 1 ((exp cos 2) Theta))))
+