September Equinox 2024 Timeline. The dates are based on coordinated universal time (utc), which is equivalent to. In west asia, according to the iranian calendar, the september equinox signifies the first day of mehr or libra.
The fall equinox, which starts libra season, is on sunday, september 22, 2024. When do the four seasons start in 2024—for spring, summer, fall, and winter?