The Sun shining through the Stonehenge monument. Sun rise on the summer solstice was the most important time the Sun would shine through the monument. Click on image for full size (44K JPEG) Windows Original

Stonehenge does exhibit alignments with the Sun and the Moon. In fact, the main axis of the monument faces the horizon where the Sun rises midsummer morning, the longest day of the year. But the axis really only lines up roughly. The Sun actually rises to the left of the Heel Stone (the marker for the axis). And because of the Earth's precession, 4,000 years ago, the Sun would have risen even farther off the center axis. This failure to REALLY line Stonehenge up demands an explanation if these people were practicing exact astronomy. It is possible that since these people were only using such knowledge for ritual purposes, their standards of accuracy were different from our own.

It is clear that the placement of stones in Stonehenge was planned. This could have been Stone Age brilliance or it could have been just the moderately observant farmer's knowledge of the sky. Because we haven't found any written records from its makers, we just don't know!