Autumnal Equinox 2015 date and time:

Autumnal Equinox 2015 date and time::

The word “equinox” originates from the Latin words for "equal night." The fall and spring equinoxes are the only days in the whole year in which the Sun passes the celestial equator. The Northern Hemisphere's autumnal equinox—the first day of fall—occurs Thursday, September 22, 2016. September Equinox in Jaipur, Rajasthan, India is on Wednesday, 22 September 2016, 13:52 IST.

The formality is practiced on the full moon day of the Hindu month of “Shravan”, on which sisters tie the holy Rakhi string on the right wrists of their brother, and pray for their long peaceful life. Rakhis are generally made of silk with silver and gold threads, beautifully crafted embroidered beads, and studded with the semi-precious stones.

History of Autumnal Equinox

In the past, humans normally spent much more time outside than we do. So, they used the sky as clock and calendar. They could simply see the sun’s path across the sky, the length of daylight and also the location of the sunrise and sunset, because these all shift in a systematic way throughout the entire year.

Our descendants built the first laboratories to track the sun’s progress. One example is at Machu Picchu in the Peru, where the Intihuatana stone, has been shown to be an accurate sign of the date of the two equinoxes and other important celestial periods. The word “Intihuatana”, by the way, accurately means for tying the sun.

Lag of the Seasons

Describing the start of the seasons on the bases of sun's positions may seem illogical. Finally, in the summer, daylight initiates to grow shorter just as the season formally starts.

Should not the June solstice in its place be called midsummer, as was celebrated during period of Shakespear?

According to meteorological perspective, the answer is no.

This gap means that, in the Northern Hemisphere, the hottest days of summer do not really arrive until late July and start of August, and on the other hand, the coldest days of the winter are in months of January and February.

Due to same reason, though the peak of solar heat in the Arctic occurs on the Northern Hemisphere's summer solstice, the highest melt rate always arises in July, because it takes a time for the melt to get going.

Normally, the melt rate starts to slow in August because the sun gets lower in the sky. The sea ice slightest usually occurs around September 13, which is some days before the start of fall.

This consistency allowed the construction of Stonehenge in England almost 5,000 years back, where the sunrise on the summer solstice was celebrated with passion.

Autumnal Equinox Illusions

The days of day-night equality all the times fall after the autumnal equinox and beforehand the vernal equinox, Geoff Chester, a public affairs professional with the U.S. Naval Observatory in Washington, D.C., described to National Geographic News in 2005.

The difference is a matter of atmosphere, geometry and also the language.

Both day and night would each be accurately 12 hours long on a spring or fall equinox merely if the sun were a single point of light and Earth had no atmosphere.

As seen from Earth, the sun, is nearly as large as a little fingertip held at arm's length—a size well-known to the astronomers as half a degree wide.

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