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  2. www.bbc.co.uk › weather › articlesAutumn equinox 2024: When is it? - BBC Weather

    Sep 6, 2024 · When does autumn begin this year? What is the equinox? And when do the clocks go back? Simon King has the answers.

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  4. www.rmg.co.uk › topics › what-when-autumnal-equinoxWhat is the autumnal equinox? - Royal Museums Greenwich

    • Astronomical
    • Meteorological
    • Phenological

    Astronomically, the four seasons centre around the equinoxes and solstices. However, there is disagreement between those who see the equinox or solstice as the start of the season, and those who hold that it represents the middle of the season.

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    By contrast, meteorologists tend to divide seasons into periods of three whole months based on average monthly temperatures, with summer as the warmest and winter as the coldest. On this basis, for most of the northern hemisphere the autumn months are usually September, October, and November.

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    The third way of defining autumn is to use what are known as phenological indicators. These cover a range of ecological and biological signs, such as the leaves falling off the trees and the migration of birds to warmer climates. These events of course are greatly influenced by weather and climate, and so changing climate could cause autumn to star...

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  5. www.timeanddate.com › calendar › autumnal-equinoxWhen Is the First Day of Fall 2024 and 2025? - timeanddate.com

    Fall 2024 and 2025 Dates. According to the astronomical definition, fall begins with the autumnal equinox. In the Northern Hemisphere, it's the September equinox; south of the equator, it is the equinox in March. What is an equinox? Equinoxes and solstices in your city. Autumn Equinox, Northern Hemisphere (September)

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  7. www.britannica.com › science › autumnal-equinoxAutumnal equinox | Definition, Dates, & Facts | Britannica

    Aug 23, 2024 · autumnal equinox, two moments in the year when the Sun is exactly above the Equator and day and night are of equal length; also, either of the two points in the sky where the ecliptic (the Sun’s annual pathway) and the celestial equator intersect.

    • The Editors of Encyclopaedia Britannica

  8. www.almanac.com › first-day-fall-autumnal-equinoxWhen is the First Day of Fall? Autumnal Equinox 2024

    Sep 23, 2024 · In 2024, the autumnal (fall) equinox arrives on Sunday, September 22, marking the official first day of fall. Here's everything you should know about the fall equinox—plus our favorite fall facts, folklore, photos, and more!

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  9. www.metoffice.gov.uk › equinox-and-solsticeThe Equinox and Solstice - Met Office

    The spring equinox marks the beginning of spring and from this day forward the day is longer than the night. Similarly, the autumn equinox marks the start of autumn as the night becomes...

  10. www.metoffice.gov.uk › when-does-autumn-startWhen does autumn start? - Met Office

    Sep 23, 2023 · This year autumn begins on 23 September 2023 and ends on 22 December 2023. The astronomical calendar determines the seasons due to the 23.5 degrees of tilt of the Earth's rotational axis in...