autumnal equinox

Or, as we say north of the equator, happy autumnal equinox!

On September 23, 2023, the autumnal equinox will signal the coming of fall for the Northern Hemisphere.

Traditionally, summer and winter solstices helped mark the changing of the seasons—along with their counterparts, the spring and autumnal equinoxes.

In an email, Dr. Nixon said his team was particularly excited to see what would happen in 2025, when Titan would reach its northern autumnal equinox.

This year, the warm days have not only surpassed the September 22 autumnal equinox but are expected to continue through Oct.