SunCalculator v1.10 has been ported (2014/04/10) to OS/2 and eComStation.
"This is a tool for calculating Sunrise, Sunset and dawn times."
File: ftp://ftp.netlabs.org/pub/qtapps/SunCalculator-1.10-os2.7z

This port requires the Qt 4 libraries and libc libraries.
Link: http://trac.netlabs.org/qtapps/wiki/QT4%20Scientific
Office Web SIte: http://www.konarski-wuppertal.de/andreaskw/SunCalculator.html
Por by Elbert Pol