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Angle either side of due east of solstice sunrise (D) at latitude (L) on planet of axial inclination (i)
sin(D) = sin(i)/cos(L)
Ref: http://www.exo.net/~pauld/activities/astronomy/stonehenge.htm
Java Applets: http://www.jgiesen.de/sunmoonpolar/
--
simon
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