(Edit the following field for interval calculations.)  

Copyright (C) 1998 by Numerical Recipes Software. Permission is granted for unlimited copying and redistribution, provided that this copyright notice, and the following two links, are preserved. All calculations are embedded as JavaScript, so an exact copy of this page's source code will generally work from any server (no CGI script needed).
(You might be interested in NOAA's Sunrise/Sunset Calculator, also a pure JavaScript HTML file with many embedded calendar functions.)
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