[famous]

OK, the piece really isn't about how pre-Julian calendars defined the seasons or how and when they may have gone off the rails. It's an argument for why [1] meteorological seasons, starting a few weeks before the solstices/equinoxes, is the way to go, and [2] even if you are adamant about strictly astronomical seasons, beginning them on cross-quarter days makes more sense than the system we use now. One system used over 2,000 years ago doesn't figure into it.