Summer was fun while it lasted, Warminster!

The season officially ends at 10:49 a.m. Saturday. That's the moment when the Autumnal Equinox occurs in the Eastern United States.

The Old Farmer's Almanac explains what's happening:

On the first day of fall—the autumnal equinox—day and night are each about 12 hours long (with the actual time of equal day and night, in the Northern Hemisphere, occurring a few days after the autumnal equinox). The Sun crosses the celestial equator going southward; it rises exactly due east and sets exactly due west.

Here are a few ideas to help you mark the day:

• Walk away your stress: Hit the trails at the Churchville Nature Center. Hours today are 10 a.m. to 5 p.m. (If tomorrow is better for getting out, they will have their Lenape Village open for public tour. Bring the kids.)

• Argue with a friend that Golden Delicious is the superior apple for pie: Solebury Orchards is open Saturdays until 6 p.m. at   3325 Creamery Road, New Hope (Save us a slice!)

• Get lost: Grab the car and hit the Delaware Art Museum. Today they have a special fall equinox program where you can walk the labrynth at 1 p.m. with no fee.

Do you know of other events to mark the start of fall? Hosting one yourself? Add them in the comments section below.