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It's amazing what one can do with no TV and modern tech and modern jobs that waste so much time. No light pollution also show the heavens in a new light so to speak. The surely had a lot of time on their hands especially at night. And we don't really know when they started... just think how much has ben achieved in the last 1000 years, To me it's not surprising that in 9000 years they worked out all that stuff.

Great article! It's remarkable that a society so ancient had the ability to calculate and align the monument in coordination to solar movements.

loved the article!!!!

love, light and blessings

AB

The mounds look like flying saucers under the grass...but seriously, awesome article and thanks for the info. Passing it on...

Actually 4 square miles is an area of for example square with each side of 2 miles in length. Translated to kilometres that's then a square with sides of roughly 3,2 kilometres which is roughly 10,24 square km's.
1 square mile is roughly 2,59 square kilometres as the multiplier is not 1,6x1=1,6 but 1,6x1,6=2,56.