Dear David, You say, in the context of calculating solar azimuth that...
> Refraction has no effect on azimuth... Hmmm. This is absolutely true but, alas, the truth may well throw a beginner. Imagine calculating the azimuth of sunrise and going out with a friend one morning before dawn and pointing confidently where the sun will rise. Unless your calculation takes account of refraction you will have the time of sunrise wrong and hence the azimuth. Refraction means that the sun appears to rise before naive calculation says it will and, hence, its azimuth will be displaced. One of the great things about sundials is that even the simplest problem gets tougher once you look at it carefully! Frank King Cambridge, U.K. --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
