Pic: time.com

With March 20 marking the vernal equinox (one of two days during the year where day and night are the same length) attention turns again to one of the more persistent theories for Stonehenge’s origin, reports Time. In a 1965 book, “Stonehenge Decoded,” astronomer Gerald Hawkins offered the then-most comprehensive hypothesis to date of Stonehenge’s purpose. Hawkins saw the cluster of stones, constructed in phases from around 3100 B.C. through 1600 B.C., as an ancient astronomical calendar.

In a modern twist on Geoffrey’s account, some argue that space aliens, rather than Merlin, constructed Stonehenge. These theories feed off the fact that no one’s exactly sure how the rocks got to their present location — the origin of some were traced as far as a Welsh mountain range 137 miles away from the Stonehenge. Although modern tests employing only technology from the era have moved similar stones, there’s still no full explanation for how ancient people managed such a feat. Hence, aliens.

Read the other fascinating theories at the time.com website.

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