What is the difference between autumn astronomically and in meteorology?

Arab Weather - Autumn is considered one of the transitional seasons that brings with it clear changes in the weather and landscapes. Autumn can be defined in different ways, whether astronomically or meteorologically. The following is a comparison between the astronomical and meteorological definitions of autumn :

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Autumn Astronomically

1. Date: Astronomical autumn is defined by the Earth's movement relative to the sun. This season begins in the Northern Hemisphere on the day of the autumnal equinox, which usually falls on September 22 or 23 of each year , and ends on the day of the winter solstice on December 21 or 22 .
2. Astronomical phenomenon: On the day of the autumnal equinox, the length of day and night are equal due to the sun being directly over the equator, resulting in equal amounts of day and night illumination throughout the world.

Autumn meteorologically

On the other hand, the meteorological definition of autumn depends on climate changes and weather patterns. The following are its most prominent features:

1. When: Meteorological autumn begins on September 1 and lasts until November 30 in the Northern Hemisphere.
2. Weather phenomena: This definition is based on climatic observations and temperature fluctuations, as the weather gradually changes from the hot summer weather to the cooler, autumnal weather. Meteorologists use this definition to make it easier to divide the year into fixed three-month seasons, which makes it easier to record and compare climate data across years.

The main differences between astronomical and meteorological autumn

The main difference between the two definitions is the basis on which each is based. Astronomical autumn is based on the position of the sun in the sky and its angle of inclination relative to the equator, which makes it related to the movement of the Earth around the sun.

While meteorological autumn is based on weather patterns and temperatures, making it more consistent with actual weather changes that people on the ground observe.

Both the astronomical and meteorological definitions of autumn have special significance in their respective fields. Astronomical seasons are used to define astronomical phenomena, while meteorological seasons are used to analyze climate data and provide more accurate weather reports. Understanding these differences helps us understand how the Earth's movement around the sun and weather patterns affect our daily lives and the nature of our environment.

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