When Is The First Day Of Fall In 2025

David Muir

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08-12-2024

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The first day of fall, also known as the autumnal equinox, in 2025 will be on September 23rd.

This date marks the astronomical beginning of autumn in the Northern Hemisphere. The autumnal equinox occurs when the sun crosses the celestial equator, moving from the Northern to the Southern Hemisphere. At this point, day and night are roughly equal in length across the globe.

It's important to note that the exact time of the equinox varies slightly each year, depending on the Earth's orbit. While September 23rd is the generally accepted date, you might see some sources citing a slightly different time depending on their location and time zone calculations.

Understanding the Autumnal Equinox

The autumnal equinox is a significant event in many cultures, marking a time of harvest, change, and reflection. It signals a shift in the seasons, leading to cooler temperatures, shorter days, and the eventual arrival of winter.

The date of the equinox is determined by the Earth's tilt on its axis and its orbit around the sun. As the Earth orbits the sun, different parts of the planet receive varying amounts of sunlight, causing the seasonal changes we experience.

Other Ways to Determine the Beginning of Fall

While the autumnal equinox marks the astronomical start of fall, some people use other indicators, such as meteorological fall (September 1st), or phenological fall (based on observations of plant and animal life changes). These methods offer alternative perspectives, but the astronomical equinox remains the most widely recognized scientific definition.