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Know why Autumnal Equinox is called the First Day of Fall

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  • Know why Autumnal Equinox is called the First Day of Fall





    New Delhi: Find out why September 22 is known as the First Day of Fall. This is a day to say goodbye to summer and welcome the advent of a pleasant weather before the chilly winter freezes you.

    Geographically, as autumn begins, Earth’s axis gets tilted neither away from nor towards the sun, allowing the sun’s direct rays to shine overhead at the equator before moving into the Southern Hemisphere.

    On this day, nearly all locations on Earth, except the poles, experience 12 hours day and 12 hours night.

    According to National Geographic report, in the Northern Hemisphere, September features the autumnal equinox, while in the Southern Hemisphere, June features the autumnal equinox.

    The vernal (spring) and fall (autumn) equinoxes are the only two times during the year when the sun rises due east and sets due west.

    According to the Huffington Post, on Sep 22, the sun appears to cross this equator, moving from north to south in the area of the constellation Virgo.

    The report says that Earth's four seasons — winter, spring, summer and fall — are demarcated by equinoxes and solstices. After the winter solstice on Dec. 21, the next season change will come with the spring, or vernal, equinox on March 20, 2013, and then the summer solstice on June 21, 2013. Finally, we'll come full circle one year from now, with the next autumnal equinox on Sept. 22, 2013.

    A Washinton Post report says on the Northern Hemisphere's autumnal equinox, a person at the North Pole would see the sun skimming across the horizon, signaling the start of six months of darkness.

    On the same day, a person at the South Pole would also see the sun skim the horizon, beginning six months of uninterrupted daylight, it adds.

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