re sunrise sunset times in article r f a ai news umbc edu rouben math math umbc edu rouben rostamian writes how the length of the daylight varies with the time of the year experiment with various choices of latitudes and tilt angles compare the behavior of the function at locations above and below the arctic circle if you want to have some fun plug the basic formulas into lotus use the spreadsheet auto re calc and graphing functions to produce bar graphs based on latitude tilt and hours of day light avg pat
