THE summer comes to an end on Thursday (20), with the phenomenon of autumn in the southern hemisphere. Already, in the north of the earth, the station becomes spring.
In the southern hemisphere, the Fall of 2025 It starts exactly this Thursday (20), at 6:01 am and will extend until June 20th. This passage of stations is a reflection of the axial inclination of the Earth in relation to its orbital plan.
During the season, day and night usually are approximately the same duration due to the sun’s rays that reach the earth more directly on the equator line. This results in a more uniform distribution of sunlight in both hemispheres. Even the word “equinox” comes from the Latin “aequinoctium“, Whose meaning is“equal night “.
THE CNN , Marco Aurélio de Menezes Franco Professor and Doctor of the Department of Atmospheric Sciences, Institute of Astronomy, Geophysics and Atmospheric Sciences (IAG), University of São Paulo (USP ) explains that during the fall, the days begin to shorten as a specific region of the planet moves away from the sun.
“In our case, in the southern hemisphere, it results in a decrease in direct sunlight and, consequently, milder temperatures . The transition marks the preparation of nature for the winter with the fall of tree leaves and a characteristic color palette as plants are preparing for the colder season. ”
Understand the phenomenon
Summer change to autumn after the equinox phenomenon may have different characteristics according to the region. In general, the color of flowers is the altered, with more yellowish shades, temperatures are milder, especially in the southern and southeastern regions of Brazil, and the sun is earlier due to the inclination of the earth.
While the autumn equinox happens in the southern hemisphere, in the northern hemisphere the spring equinox occurs. This is because the earth rotates along an imaginary line that goes from the north pole to the south pole. It is called axis, and this rotation is what gives us day and night.
The axis is inclined 23.5 degrees, which causes one hemisphere on the planet to receive more sunlight than the other for half the year’s orbit around the sun. This discrepancy in sunlight is what triggers the stations.
The effect is maximum at the end of June and late December, when solstices are lived, when differences in time between day and night are larger, especially close to the poles.
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This content was originally published in autumn equinox: understand phenomenon that happens this Thursday (20) on the site CNN Brazil.
Source: CNN Brasil
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