![]() ![]() On the first day of the fall in the Northern Hemisphere, the Earth is perfectly aligned sideways to the Sun. However, on the spring and autumn equinoxes, the Sun shines almost equally on the Northern and Southern Hemispheres. ![]() Because of the Earth's axis being tilted with respect to the Sun-Earth plane, the Sun shines unevenly over the Northern and Southern Hemispheres and it is the tilt which results in seasons. Similarly, the March equinox is known as the Spring equinox in the Northern Hemisphere.ĭuring the equinoxes, both the Northern and Southern Hemispheres receive equal amounts of daylightĮquinoxes happen only twice a year. The September equinox is known as the Spring equinox in the Southern Hemisphere. Meanwhile, in the Southern hemisphere, fall begins in March. The Autumn equinox marks the first day of fall or autumn in the Northern Hemisphere. On the day of an equinox, Earth's axis is tilted 23.5 degrees from the plane of its orbit. While Earth's journey around the Sun drives the astronomical seasons, annual temperature cycles guide the meteorological seasons.Īn equinox is caused by Earth's tilt on its axis as it revolves around the Sun. ![]() The subsolar point on a planet is the point at which the Sun is perceived to be directly overhead, and where the Sun's rays strike the planet exactly perpendicular to the surface. At the poles, the Sun approximately bestrides the horizon for the entire day, according to Alphonse Sterling, an astrophysicist at NASA's Marshall Space Flight Center in Huntsville, Alabama, the space agency says on its website.Īn equinox is an event in which Earth's subsolar point passes through its equator. September through November is considered fall.Īn equinox is an astronomical event in which the Sun shines directly over the equator resulting in nearly equal amounts of day and night throughout the world, except for the North and South Pole. Each year, the meteorological season of spring begins on March 1 and ends on May 31.Įarth’s tilt on its axis and the ceaseless motion the planet has while orbiting the Sun result in the equinoxes and solstices. “Meteorological seasons” are based on seasonal temperature variations modified by fluctuations in the amount of solar radiation received by Earth’s surface over the course of a year. The tilt of Earth’s axis with respect to the Sun-Earth plane, and the planet’s position during its orbit around the Sun are responsible for the “astronomical” seasons. This year, the Autumn equinox falls on September 22 at 8:04 pm CDT (September 23, at 6:34 am IST in India).Įarth has two types of seasons, namely meteorological and astronomical. The Autumn equinox may occur any time between September 21 and September 24. The Autumn equinox, also known as the September equinox, marks the beginning of the astronomical fall season in the Northern Hemisphere. Autumn Equinox 2022: Autumn is characterised by falling leaves and cooler temperatures. ![]()
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