The fall equinox marks the first day of autumn. When does fall officially begin in 2025? This visual guide will help get you ...

Equinoxes occur twice a year, with night and day being almost the exact same length all across the world. The next equinox is ...

There are two equinoxes and two solstices every year. Daylight on Sept. 22, 2025, will last roughly the same length of time ...

This year, the autumnal equinox in the Northern Hemisphere falls on Monday, Sept. 22. If you want to be extra specific and mark it on your calendar, mark it for 11:19 a.m. PT. The meaning of equinox ...

Meteorological fall begins on September 1, while astronomical fall starts on September 22 at 2:19 PM ET. Meteorological seasons are based on temperature, while astronomical seasons are based on the ...

Monday, Sept. 22 is what many consider the first official day of fall: The fall equinox. The equinox marks the moment when ...

According to NASA, the equinox occurs twice a year, once in March and once in September, when the day and night are of equal ...

A rare fall phenomenon is here - but not for long. Here's what you need to know about "Chicagohenge," including how and when ...

As leaves turn brown, evenings darken and pumpkin spice lattes return, it may feel like autumn has arrived. But the first official day of autumn is not until 22 September, so what is happening?