Asia Pacific
In most parts of the world, day and night will be nearly equal in duration between September 21 and 23, with each lasting approximately 12 hours.
In most parts of the world, day and night will be nearly equal in duration between September 21 and 23, with each lasting approximately 12 hours. This occurs around the autumnal equinox because the Sun is positioned directly above the equator, causing sunlight to be distributed almost equally across the Earth. As a result, the length of day and night is also nearly equal. The same phenomenon occurs in March, when the spring equinox begins.
According to an astronomical journal, autumn begins in the Northern Hemisphere while spring begins in the Southern Hemisphere between September 21 and 24 each year. Although the duration of autumn has shortened in recent years, the autumnal equinox still occurs every year between September 21 and 24. This is the time when the Sun crosses the equator while moving from the Northern Hemisphere toward the Southern Hemisphere. As a result, day and night will be approximately 12 hours long in most parts of the world, including Pakistan.
It should be noted that the equator is an imaginary line drawn around the middle of the Earth that divides the planet into two equal halves, the Northern and Southern Hemispheres. During the autumnal equinox, the Sun rises due east and sets due west, making it an important astronomical event. Before the autumnal equinox, the Sun rises in the northeast, while after the equinox, it rises in the southeast. The Earth is tilted on its axis as it orbits the Sun. As a result, at different times of the year, varying amounts of sunlight and heat reach our planet directly. During the autumnal equinox, the Sun is positioned over the equator, so nearly equal amounts of sunlight reach different parts of the world. At this time, the lengths of day and night are also nearly equal, at approximately 12 hours each.
The same phenomenon occurs in March, when the spring equinox begins and the Sun crosses the equator while moving northward. The Tropic of Cancer period begins in June, while the Tropic of Capricorn period begins in December. The Tropic of Cancer marks the longest day of the year, after which the length of daylight begins to decrease. The Tropic of Capricorn marks the shortest day of the year, after which daylight begins to increase. Day and night become nearly equal in duration in March and September, although this does not occur exactly in some regions. The word “equinox” it means “equal night.”
In ancient times, the seasons were determined by the spring equinox, autumnal equinox, Tropic of Cancer and Tropic of Capricorn. This year, the autumnal equinox will begin on September 23. After that, daylight will gradually decrease and nighttime will increase in the Northern Hemisphere, while the opposite will occur in the Southern Hemisphere.
