Where is the Sun

Have you wondered where the sun will be?

With the position of the sun, you can
 * Photography: find the best time taking your photograph.
 * Travelling: avoid the strong sunlight.
 * Curiosity: learn the sun's trajectory in the sky.
 * ...

With "insolation", the amount of sunlight coming through a window, you can
 * If you're finding a place to live, figure out what's the implication of the window facing.
 * Understand why your room is warmer/cooler at certain times of a day