How to make a solar compass

You need a watch, a needle (or a tiny stick) and this drawing, named BUSO by its inventor:

• Place BUSO horizontally (very important!)
• Place the needle (or stick) vertically on the drawing, on the spot corresponding to the current time (hour)
• Rotate BUSO until the needle’s shadow overlaps the intersection spot between the mark corresponding to the current month of the year and the vertical axis of BUSO
• This is the North-South axis. You can now place the map accordingly. Even better, you can stick the BUSO drawing onto your map, with the N mark aligned with the north on the map.
• The drawing is presented in real size.
• Have fun with BUSO!

This is an example of BUSO in use: