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EPL- INFORMATION FOR YOUR BUILDING SOUL

June Solstice: Longest and Shortest Day of the Year

The June solstice is the Summer Solstice in the Northern Hemisphere and theWinter Solstice the Southern Hemisphere. The date varies between June 20 and June 22.

The June Solstice. (Not to scale)

June Solstice in Sacramento, California, U.S.A. is on
Sunday, June 21, 2015 at 9:39 AM PDT (Change city)

June Solstice in Universal Coordinated Time is on
Sunday, June 21, 2015 at 16:39 UTC

• Local times for June Solstice 2015 worldwide
• Sunrise, sunset and day length around June Solstice 2015
• Day and Night map for June Solstice 2015
• Countdown to June Solstice 2015 in Sacramento, California, U.S.A.
• Equinoxes and solstices from 2000–2049

Zenith Away from the Equator

A solstice happens when the sun's zenith is at its furthest point from the equator. On the June solstice it reaches its northernmost point and the Earth’s North Pole tilts directly towards the sun, at about 23.5 degrees. It's also known as the northern solstice because it occurs when the sun is directly over the Tropic of Cancer in the Northern Hemisphere.

Meaning of Solstice

'Solstice' (Latin: 'solstitium') means 'sun-stopping'. 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.

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.

Stonehenge in England.

©bigstockphoto.com/dubassy

Solstices in Culture

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.

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.

Midnight Sun or Polar Night?

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.

Sunrise and Sunset times

On the other side of the planet, south of the Antarctic Circle there's Polar Night, meaning no Sunlight at all, on the June Solstice.

Solstice Dates Vary

The June solstice dates vary. For example, it's on June 21 in 2015, but on June 20 in 2016. A June 22 solstice will not occur until 2203. The last time there was a June 22 solstice was in 1971.

The varying dates of the solstice are mainly due to the calendar system – most western countries use the Gregorian calendar which has 365 days in a normal year and 366 days in a Leap Year.

A tropical year, the time it takes the Earth to orbit the Sun completely, is ca. 365.242199 days, but varies slightly from year to year because of the influence of other planets. The exact orbital and daily rotational motion of the Earth, such as the “wobble” in the Earth's axis (precession of the equinoxes), also contributes to the changing solstice dates.

Moving to Other Seasons

Equinoxes and Solstices

After the June solstice, the sun follows a lower and lower path through the sky each day in the Northern Hemisphere until it reaches the point where the length of daylight is about 12 hours and eight to nine minutes in areas that are about 30 degrees north or south of the equator.

Areas 60 degrees north or south of the equator have daylight for about 12 hours and 16 minutes. This is theSeptember Equinox, the Autumnal Equinox in the Northern Hemisphere.

Earth does not move at a constant speed in its elliptical orbit. Therefore the seasons are not of equal length: the times taken for the sun to move from the March Equinox to the June Solstice, to the September equinox, to the December solstice, and back to the March equinox are roughly 92.8, 93.6, 89.8 and 89.0 days respectively.

The consolation in the Northern Hemisphere is that spring and summer last longer than autumn and winter.

Topics: Astronomy, Sun, Seasons