Autumn has begun.. Learn about the September equinox and the sun perpendicular directly above the equator

Today is the September equinox, which falls on the first day of autumn in the northern hemisphere. “The September equinox is the time when Earthlings welcome a new season,” NASA explained, adding, “For those in the northern hemisphere, enjoy the start of more weather.” equinox and say hello to early sunset and late sunrise.”

According to the British newspaper “Daily Mail”, during the equinox, the sun rises directly above the equator, resulting in approximately equal amounts of day and night around the world.

Two separate dates that can be used to mark the beginning of autumn in calendars are astronomical autumn and meteorological autumn, since meteorological autumn is guided by annual temperature cycles.

The Bureau of Meteorology explains that “meteorological seasons are derived by dividing the year into four periods of three months each.”

These seasons are divided to coincide with the Gregorian calendar, making it easier for meteorological observation and forecasting to compare seasonal and monthly statistics.

According to the meteorological calendar, the first day of autumn is always September 1; It ends on November 30, and the seasons are designated as Spring (March, April, May), Summer (June, July, August), Autumn (September, October, November) and Winter (December, January, February).

Meanwhile, sidereal autumn, as at the current equinox, is defined by the Earth’s journey around the sun.

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