A very usefull 3D calendar with an user friendly interface that offers a lot of functions like: moon phases, biorhythm calculator, regional holidays and others. 

You can find useful information about current moon phases, sun phases, seasons and much much more as shown above. 

If you are planing on traveling and you are not sure about the distance you can use the City Distance Calculator, which provides distances between major cities in Europe, US, Asia, Africa and others. 

Biorhythm calculator is so easy to use. Just type in your name, date of birth select your lines and you are ready to go.