So it seems that at least in North America, the seasons don't map directly
to the inverse of Australia. Case in point, spring started today, on March
20, when if you were to invert autumn, should have started on the first of
the month.
In fact, my research seems to suggest that the seasons change around the
20th to the 22nd of the month, but it's all based on on Equinoxes and
Solstices, so it wouldn't surprise me if it moves around slightly year to
year, like Easter does.
That said, the source of all
knowledge is trying to tell me that summer in the southern hemisphere
begins on November 6, which is news to me.
In fact, further research tends to suggest that the northern hemisphere
hasn't got a fucking clue when the seasons start, and are all over the place
like a dog's breakfast.
I'm feeling very seasonally confused.