About 4.8 Billion Years Ago when the Earth first came into becoming a Planet going around the Sun.
I don’t think anyone was around to celebrate then. 🙂
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It’s difficult to say when, but I’d hazard a guess that when the first agricultural communities emerged, those communities started to mark the seasons as it was fundamental to know when to sow and reap and so on. I may be wrong on this, but I believe that the great megaliths and henges found in Britain and Ireland coincide with the arrival of agriculture – more or less. So, perhaps we’re not far off the mark with saying that solstice celebrations began with agriculture. Maybe?
Bennathow
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