If the winter solstice is the longest night of the year, why does it mark the beginning of winter, rather than the very middle of it?

Question

If the winter solstice is the longest night of the year, why does it mark the beginning of winter, rather than the very middle of it?

In: Earth Science

Answer 1

In Australia, first day of Spring is September 1, December 1 is first day of Summer….etc.