Chasing shadows at Watchtree

 I was watching the shadow of a wind turbine at Watchtree as it raked across the meadow.

 Later we stood as the shadow came rushing across us.

When timing the shadow and the blades, you must have the same time for the same movement. But if the Sun is low and the shadow is being projected over a bigger distance, the shadow will move further than the blade in the same time. Thus the shadow will move faster in those circumstances. In theory it is possible for the shadow to move faster than the speed of light!