On the day of the new quarter the shadow cast by the higher stone moves across the lower stone, which stands 4.1m away. The stones are today leaning and their straightened up positions were calculated (the higher stone 9° and the lower 3°).
The animation shows the shadow’s passage the day before the new quarter, exactly on the day of the new quarter, and the day after:
The gradient of the top of the stones are in good alignment with the sun’s path.
The shadow from the higher the stone is correct on January 15, which is 28 days after the winter solstice.
Despite the fact that the stones today are leaning, one can today see how the shadow falls. The next opportunity is 25-26 days after the winter solstice on 15th or better 16th January 2015, between 13:30 and 13:40.