The autumnal equinox heralds the arrival of fall in the northern hemisphere, and it's just around the corner. Here's what to know.

During an equinox, places around the globe experience nearly equal amounts of daytime and nighttime. The second occurrence this year happens on Sunday.

Fall weather is soon going to be hitting the Northeast and just in time as the official start to fall — the autumnal equinox — is about to arrive. The fall — or autumnal — equinox can land on Sept. 22 or 23 depending on the year This year,