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http://williams.best.vwh.net/sunrise_sunset_algorithm.htm

http://williams.best.vwh.net/sunrise_sunset_example.htm

To get sunrise/sunset data for a year at a clip:
http://www.cmpsolv.com/los/sunsetexp.html

Java Numeric Issues

http://www.ibm.com/developerworks/java/library/j-jtp0114/

BigDecimal.equals() only compare the integer value (the LHS) and the scale (# of digits on the RHS), not the actual RHS value.