20/06/2015

The June solstice

The word solstice is derived from the Latin sol (sun) and sistere (to stand still), because at the solstices, the Sun stands still in declination; that is, the seasonal movement of the Sun's path (as seen from Earth) comes to a stop before reversing direction.


The point on the horizon where the sun appears to rise and set, stops and reverses direction after this day. On the solstice, the sun does not rise precisely in the east, but rises to the north of east and sets to the north of west, meaning it's visible in the sky for a longer period of time.
At latitudes in the temperate zone, the summer solstice marks the day when the sun appears highest in the sky. However, in the tropics, the sun appears directly overhead (called the subsolar point) some days (or even months) before the solstice and again after the solstice, which means the subsolar point occurs twice each year.

The term solstice can also be used in a broader sense, as the date (day) when this occurs. The day of the solstice is either the longest day of the year (in summer) or the shortest day of the year (in winter) for any place outside of the tropics.
The term solstice can also be used in a wider sense, as the date (day) that such a passage happens. 



A solstice is an astronomical event that occurs twice each year as the Sun reaches its highest or lowest excursion relative to the celestial equator on the celestial sphere. 



The solstices, together with the equinoxes, are connected with the seasons. In many cultures the solstices mark either the beginning or the midpoint of winter and summer.

In some languages they are considered to start or separate the seasons; in others they are considered to be centre points (in England, in the Northern Hemisphere, for example, the period around the northern solstice is known as midsummer, and Midsummer's Day is 24 June, about three days after the solstice itself). Similarly 25 December is the start of the Christmas celebration, and is the day the Sun begins to return to the Northern Hemisphere.

The June solstice is the Summer Solstice in the Northern Hemisphere and theWinter Solstice the Southern Hemisphere. 

www.timeanddate.com



On the June solstice, the midnight sun is visible (weather permitting) throughout the night, in all areas from just south of the Arctic Circle to the North Pole.




The date varies between June 20 and June 22, this year it's on June 21.

On the solstice, the sun does not rise precisely in the east, but rises to the north of east and sets to the north of west, meaning it's visible in the sky for a longer period of time.
In the Southern Hemisphere, where the June solstice is known as the shortest day of the year, it marks the first day of astronomical winter, but the middle of winter in meteorological terms.

Although the June solstice marks the first day of astronomical summer, it's more common to use meteorological definitions of seasons, making the solstice midsummer or midwinter.

Over the centuries, the June solstice has inspired countless festivals, midsummer celebrations and religious holidays.
One of the world's oldest evidence of the Summer Solstice's importance in culture is Stonehenge in England, a megalithic structure which clearly marks the moment of the June Solstice.


Stonehenge in England.©bigstockphoto.com/dubassy


Source: Wikipedia, Timeanddate
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2 comments:

  1. Happy Solstice!!

    Full article- http://newskafe.com/happy-summer-solstice-the-special-day-sun-rises-from-north-of-east/

    ReplyDelete

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