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Stonehenge may have been used as a solar calendar

"These differences suggest that the people who constructed Stonehenge may have seen every 10th day as being important — possibly representing a "week" of sorts, Darvill said. "The months are each divided into three weeks of 10 days," wrote Darvill."

So, when did the 7 day week appear in archaeology and why the change from 10 to 7?
 
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Okay, I am going there concerning the 10 day week vs. 7 day week and it is not *religion*. We do indeed have other archaeology reports on this topic. Calendrical Interpretation of Spirals in Irish Megalithic Art, Calendrical Interpretation of Spirals in Irish Megalithic Art - NASA/ADS (harvard.edu) February 2019

"The megalithic constructions date back to around 3'200 BC, centuries before the completion of Stonehenge and the Egyptian pyramids." I note from the paper, BAR_SEAC2018_turler_final.pdf (arxiv.org)

There are three references to *week* and this is a 7 day week, not 10 day week for these, earlier and older artifacts then Stonehenge :). Example, "The four arcs around the spiral could possibly represent the four quarters of the moon phases exactly as our seven-day weeks, since 4 x 7 days completes a month of 28 days. The two short arcs could thus be stylistic representations of the moon crescents of the first and last quarters and the two long arcs of the gibbous waxing and waning moon of the second and third quarters"

If I recall my Ancient Near East history, the Babylonians also used a 7 day week too. Babylonian calendar - Wikipedia
 
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Catastrophe

"Science begets knowledge, opinion ignorance.
New scientific discovery at Stonehenge.

I have been to Stonehenge many times, including before it was fenced in, and when you were able to touch the stones.
A recent BBC feature describes audio effects including 10 Hz vibrations due to the geometry of the stones. Computer reconstruction allows full original effects to be duplicated.

Cat :)
 
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