SunCalc
All the ideas and discussions
I found this site while thinking about which direction to orient a house on a building lot. It's extremely helpful to me. However, to be able to show a layperson (like my wife), it would be great to have an optional overlay of a window (on the screen) that represents a window in real life and where the sun would be relative to a person inside the house. A small dot, representing the sun would traverse the "window" as a small circle at the same height and arc as in reality. The window could have panes and trim and the inside of the window panes, representing the amount of sunlight coming into the house could change colors from black (night assuming no moon) through "sunrise", midday and sunset color scheme. You must be able to adjust the orientation of the window (at least N, S, E, W but ideally free rotating) but you could fix the size and height of the window and the reference point of the observer inside the house.