Every year my friend Gary publishes a book called the Lunar Calendar, which incorporates celestial cycles into a daily planner. I think what Gary does is interesting; to me it combines astronomy and some aspects of astrology. You could use this to determine when is a good time to plant your garden or go fishing.
This year the Lunar Calendar is available as a plug in for iCal and Google Calendar. We sat in my kitchen and talked about the calendar and Gary's view on auspicious moments. You can purchase The Lunar Calendar at www.LunarCalendar.biz