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You specifically said "crop planting". Are you now saying that Stonehenge was erected so that people would know when it was midsummer so that they could plant their herbs? Lot of trouble to go to for rosemary and thyme and they have to be planted long before midsummer too. Summer solstice and midsummer aren't the same thing and don't occur on the same date anyway.
Something is not right. This message is just to keep things from messing up down the road