Select the location where you want to place your paper sundial, mark a line along building wall where you want to put it.
Write your address and press Go! (e.g. Picadilly circus, london, UK)
-Zoom in as far as possible.
-Click once at one end of a long wall.
-Move to and click again on the other end.
This draws a red line parallel to the wall, and defines the orientation.