The August "Sky and Telescope" mentions an addition to Robert Urshel's wonderful Analemma site <http://www.analemma.com> Go to Other Phenomenon and download SunGraph. This program produces a graph of the sunrise and set through the year for the location you specify. It clearly shows the equation of time effect as well as the latitude effect and longitude correction.
Check it out. Thanks Robert for the addition to a great web site. Roger Bailey Walking Shadow Designs N 51 W 115
