Understanding what the vernal equinox is and when it happens – Science

a springIt begins on Saturday (23) in the southern hemisphere, a season known for its moderate temperature and the flowering of various plants. moderation – The phenomenon that occurs Twice a year.

The equinox is instantaneous and occurs at the beginning of the spring and fall seasons. During the days of this phenomenon, the day period is the same as the night period. In other words, the 24 hours of the day are divided up.”On an equal footing“In two parts. This happens because the sun’s rays fall directly on the equator.

This date falls at the end of March and September for Southern Hemisphere countries, such as Brazil. For the northern countries, since the seasons are “inverted”, the days also change. See dates:

• Vernal Equinox: September 23 in the Southern Hemisphere; March 21 in the Northern Hemisphere
• Autumnal Equinox: March 21 in the Southern Hemisphere; September 23 in the Northern Hemisphere

According to geographer Flavio Rodriguez, professor at the Federal University of Ceara (UFC), the date of the vernal equinox can occur between September 21 and 23, depending on the year. “The closer you get to the equator, the more you have 12 hours of sun and 12 hours of night. And the further you get from the equator, it becomes a little more relative.

Earth’s movement causes the equinoxes and solstices

Seasons occur from movement translation: The Earth’s rotation around the Sun, and the full cycle lasts 365 days and 6 hours.

Over time, these six hours add up and important dates change, such as the vernal equinox. “And every four years, you have a leap year,” Flavio explains.

During movement, there is a change in the way the sun’s rays fall on the planet. With movement, both hemispheres receive more or less insolation.

On the days of the equinox, when the two hemispheres alternate between autumn and spring, it is… Sunstroke is the same. As the planet moves, the lighting varies and becomes concentrated in one hemisphere.

The difference in illumination between north and south is up to Limit At the beginning of summer and winter when a phenomenon appears Coup. On these dates, it is today in the hemisphere where it is summer The longest of the year. In countries where winter begins, it is… The night is the longest of the year.

That is, from the beginning of spring, the length of the day begins to increase and the night gradually decreases until the arrival of summer. Likewise, in autumn, the nights become longer and the solar day decreases until winter.

See the dates of the coups:

• Winter Solstice: July 20 in the Southern Hemisphere. December 22 in the Northern Hemisphere
• Summer Solstice: December 22 in the Southern Hemisphere. July 20 in the Northern Hemisphere