As we move on away from the equinox I thought I would post this photo of the lines made by the shadow tip from a stick (or in this case a kids swingball!).
These two lines are from the shadows approaching noon and only one day apart. Since it is the equinox, they are near exact east/west lines. The gap between the chalk lines is at its greatest at the equinox and closes to near zero at the solstices.
On a slight tangent, it was a very similar method, ie. measuring the length of the shadows that helped the ancient Greeks come up with their first estimates of the size of the earth.