Which Tyler wrote:god's, is this still going?
Out of I treat - what is it about a different start date for the seasons that makes you think about flat earthers or Copernicus? It's never had anything to do with either.
In the UK the leaves are starting to turn, the night-time temperature is dropping, plant life is slowing down were into Autumnal weather patterns (approximately), soft fruit season has more-or-less ended and we're into hard fruits and nuts and it's getting dark around 8.00
In terms of nature, were into Autumn - which yes, is out of sync with the equinox/solstice calendar, but is still scientific, and far more relevant to what anyone would call a "season". The meteorological seasons are based in what nature is doing around us, though fudged a bit or each degree of latitude would have a different date.
Astronomical seasons are based on the position of the planet relative to the sun, and is so ony a convenient, and easily measured way to divide the year into 4 equal quarters. A more sensible approach to the astronomical season would be to place the equinox/solstice in the middle of the season - which is what the ancient (British) calendars did.
All 3 are valid, all 3 are scientific, and all 3 are used in different locations around the world. None require a geocentric perspective, and certainly none require a flat earth perspective that has never existed as common perception.
The oak and beech are fruiting here. That's my cue for a seasonal change.
And for the record, I'd love to talk about Darwin. Mutation is the vehicle for evolution, and that is my professional bread and butter. Or meat and two veg.