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The Summer Solstice is an Astronomical term regarding the position of the Sun in relation to the Celestial Equator . At the time of the summer solstice, Earth is at a point in its Orbit where one hemisphere is most tilted towards the sun, causing the sun to appear at 23.45 degrees above the celestial equator, thus making its highest path across the sky. The summer solstice is the day of the year with the longest daylight period and hence the shortest night. This day usually occurs on June 21 / June 22 in the Northern Hemisphere and on December 21 / December 22 in the Southern Hemisphere . The actual date changes due to differences between the Calendar year and the Tropical Year . THE SOLAR TERM ''XIAZHI'' IN CHINESE ASTRONOMY Xiazhi (夏至) is the Solar Term that begins when Sun reaches the Celestial Longitude of 90° and ends when its celestial longitude is 105°. It sometimes refers in particular to the day when Sun is exactly at the celestial longitude of 90°. It usually begins around June 21 , and ends around July 7 . HOLIDAYS The summer solstice along with the Winter Solstice , Vernal Equinox , and Autumnal Equinox were discovered by people in the northern hemisphere and originally referred to northern hemisphere Season s. Midsummer is the time around the summer solstice. There are traditional Holiday s celebrated in Northern Europe and elsewhere at this time. In Denmark midsummers eve is known as Sankt Hans Aften. Bonfires are lit on beaches throughout the land as darkness comes and effigies and fireworks are thrown into the fires. Summer Solstice is also celebrated as a Wicca n Sabbat , called Litha . Every year, a celebration takes place at Stonehenge . (See Sun Mythology ) In the USA , Canada , and some other countries, the summer solstice is regarded as the start of Summer . In other countries, including Ireland , the UK , China, and Japan, the summer solstice is regarded as midsummer. For example, in Ireland , summer begins on May 1 and ends on July 31 . Similary, traditional East Asia n calendars (see '' Jieqi '') refers to the summer solstice as the "extreme of summer" and not the start. The Slavs celebrate the shortest night of the year as St. John's Night . SEE ALSO
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