This sugar maple leaf shows multiple different pigments that cause it to appear green (chlorophyll), yellow (carotenoid) and red (anthocyanin). Summer has given way to fall, and with that the green of ...
The autumnal equinox — the official start of fall in the Northern Hemisphere — will occur on Monday, September 22, 2025, at precisely 2:19 p.m. EDT, according to The Old Farmer’s Almanac. This ...
The autumnal equinox is the official time to say goodbye to summer and welcome fall. Scientifically it indicated the change — shorter days and longer nights as Earth tilts closer to winter. In Arizona ...