What does moderation mean?

Autumn 2022. Autumn arrives in the Northern Hemisphere on Friday, September 23, 2022, an event appreciated to some extent by everyone … What time does the astronomical event occur and how can it be explained?

[Mis à jour le 20 septembre 2022 à 09h16] On Friday, September 23, 2022, the autumnal equinox will move the northern hemisphere from summer to fall, specifically in 3:03 a.m. (French time) to me’Institute of Celestial Mechanics and Astronomical Calculation It is located inside the Paris Observatory. The autumnal equinox marks the beginning of cooler temperatures, purple and ocher landscapes, fallen leaves, and shorter days in the Northern Hemisphere, and conversely, the beginning of warming in the Southern Hemisphere.

The first immediate effect of this astronomical event, a cousin of the vernal equinox, whose date thus corresponds to the first day of autumn: the length of the day is generally the same as the length of the night (12 hours / 12 hours) and sunlight begins to shorten in the northern hemisphere and thus in France, with Loss of brightness for 4 minutes a day. Scientifically speaking, this is the time of year when the Earth is tilted (i.e. its axis of rotation is tilted by 23.4 degrees with respect to its orbit), from one sunlight to another. The Sun It will already come to cross the Earth’s equatorial plane. Weather, definition, infographic, scientific data… Go behind the scenes of the equinox by browsing our special page using the summary above.

The arrival of autumn seems simple, but it raises many questions when we take a closer look: why does the date of autumn not always coincide with the “21” of September? How exactly does the astronomical phenomenon of the equinox occur? Here’s everything you need to know about falls.

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In 2022, the autumnal equinox officially began as an astronomical event Friday 23 September 2022. Here are the dates and times of the autumnal equinox after the autumnal equinox 2022 and estimated through 2025:

  • 2022: September 23 1:03 a.m. UTC (3:03 a.m.)
  • 2023: Sep 23 6:49 a.m. UTC (8:49 a.m.)
  • 2024: September 23, 12:43 PM GMT (2:43 PM)
  • 2025: September 22, 6:19 p.m. UTC (8:19 p.m.)

The autumnal equinox on September 23, 2022 will occur precisely at 3 am. 3 minutes 40 seconds French time (1h03 in UTC) according to the Institute of Celestial Mechanics and Ephemeris Calculation (IMCC). Then the fall continues, as it does every year, for three months until winter solstice.

The equinox occurs when the sun crosses the plane of the Earth’s equator. In summary: This is the moment when the sun crosses the height of the equator. At that time, we change the seasons. Therefore, the summer astronomical event concludes in the blink of an eye. In the Northern Hemisphere, it usually occurs between September 21 and 24. But why does fall 2022 fall on “23” and not “22” or “21”? If many of us once again identify the date “21” of September as the date of the autumnal equinox, it is not so simple. The date of the transit to autumn actually corresponds to a very precise moment: when the sun crosses the height of the equator. Scientific calculations determined this, performed by the Institute of Celestial Mechanics and Astronomical Calculation (IMCCE) hosted by the Paris Observatory since 1998. Since the Earth does not revolve around the Sun in exactly 365 days, D-Day may change from year to year.

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The date of the autumnal equinox precedes the transition to winter time. The first day of autumn also occurs midway between the summer solstice (June 20-21) and the winter solstice (December 20-21). But The autumnal equinox occurs each year on a different date. This is because the Earth revolves around the Sun in 365 days, 5 hours and 46 minutes, not exactly 365 days. Most of this discrepancy was corrected by adding February 29th through leap years. Mathematically, the autumnal equinoxes can only occur between September 21 (next time in 2092) and September 24 (next time in 2303).

autumnal equinox
Autumnal Equinox 2022 on September 23. © sborisov – Fotolia.com

What is moderation? The word comes from the Latin Aquinoctium (Equal night). In factFor us, the most obvious phenomenon of the equinox is that day and night are of the same length at this time of year. At the autumnal equinox, the days lasting about 16 hours on June 21 in France largely lost their length. Thus they will shorten until the winter solstice. why ? because of engineering. In fact, The Earth’s axis of rotation is tilted by 23.4 degrees with respect to the plane of its orbit Our planet is “tilted” with respect to the sun. A star does not illuminate us in the same way depending on the time of year. In winter, France (for example) receives only eight hours of light per day, compared to twice that in summer. This determines the behavior of air masses and leads to the appearance of the seasons as we know them in temperate regions.

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But do not confuse “equinox” with “solstice”. In astronomy, solstices correspond to the two periods of the year when the Sun is farthest from the equator. This corresponds to the maximum duration (for Summer Solstice) or the minimum (for the winter solstice) of the day. In other words, this phenomenon is very different from the phenomenon of the equinoxes, and their day and night are of the same duration!

as such’Spring equinox, the autumnal equinox is synonymous with rituals each year in some ancient cultures or beliefs (priest followers and shamanism). Called “mabon” in Celtic language, this astronomical phenomenon is called the moment when day and night have the same duration, which also corresponds to the time, in the autumn, when a significant part of agricultural products are harvested. Then pagan festivals symbolize thanksgiving for these famous crops. In ancient times, after hard work in the orchards and fields, this festival was also a welcome break.

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