3D Calendar 

3D Calendar is software that lets you set reminders for appointments, holydays, ando other events. Additionally, this program has many interesting features. One of them is the astronomical information feature. This option allows you to learn interesting information about atronomical conditions like current moon phase, sunrise and sunset hours, date and hour of the solstices and equinoxes, and so on. The program also lets you calculate easily the distance between any two important cities in the world. You only need to choose the origin and destination cities from a comprehensive list, and the program will do the calculation in no time. Also, you can see what your biorhythm will be in a given month using the Biorhythm feature. This will let you plan ahead for the energetic ups and downs you'll have.

3D Calendar is shareware and is available in English and Spanish. The trial version is fully functional during 30 days. After that time, you must register your copy if you want to continue using the program. The lifetime registration gives you the right to receive upgrades and new versions of the program.