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Ancient archaeological sites (like Stonehenge) were constructed so that the Sun would shine through a certain opening on some special day (typically a solstice). Wouldn't Earth's precession change the geometry of the situation over the years?

Michael C. West
Bethesda, Maryland

 

RELATED TOPICS: PRECESSION
Stonehenge

If you are lucky enough to stand in the center of Stonehenge on June 21, you will see the Sun rise over the Heel Stone, as it has for millennia. The Heel Stone was erected outside the main ring of stones around 2600 b.c. This rock marked the summer solstice sunrise point, and it still does some 4,500 years after it was put in place.

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