Himawari-8 Summer Solstice Midnight 2017

The summer solstice or estival solstice occurs when one of

Earth Earth is the third planet from the Sun and the only astronomical object known to Planetary habitability, harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all ...

poles Pole or poles may refer to: People *Poles (people), another term for Polish people, from the country of Poland * Pole (surname), including a list of people with the name * Pole (musician) (Stefan Betke, born 1967), German electronic music artist ...

has its maximum tilt toward the

Sun The Sun is the star at the centre of the Solar System. It is a massive, nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light a ...

. It happens twice yearly, once in each

hemisphere Hemisphere may refer to: In geometry * Hemisphere (geometry), a half of a sphere As half of Earth or any spherical astronomical object * A hemisphere of Earth ** Northern Hemisphere ** Southern Hemisphere ** Eastern Hemisphere ** Western Hemi ...

(

Northern Northern may refer to the following: Geography * North North is one of the four compass points or cardinal directions. It is the opposite of south and is perpendicular to east and west. ''North'' is a noun, adjective, or adverb indicating ...

and Southern). The summer solstice is the day with the longest period of daylight and shortest night of the year in that hemisphere, when the sun is at its highest position in the sky. At either pole there is continuous daylight at the time of its summer solstice. The opposite event is the

winter solstice The winter solstice, or hibernal solstice, occurs when either of Earth's geographical pole, poles reaches its maximum axial tilt, tilt away from the Sun. This happens twice yearly, once in each hemisphere (Northern Hemisphere, Northern and So ...

. The summer solstice occurs during the hemisphere's

summer Summer or summertime is the hottest and brightest of the four temperate seasons, occurring after spring and before autumn. At or centred on the summer solstice, daylight hours are the longest and darkness hours are the shortest, with day ...

. In the

Northern Hemisphere The Northern Hemisphere is the half of Earth that is north of the equator. For other planets in the Solar System, north is defined by humans as being in the same celestial sphere, celestial hemisphere relative to the invariable plane of the Solar ...

, this is the

June solstice The June solstice is the solstice on Earth that occurs annually between 20 and 22 June according to the Gregorian calendar. In the Northern Hemisphere, the June solstice is the summer solstice (the day with the longest period of daylight), while ...

(20, 21 or 22 June) and in the Southern Hemisphere, this is the

December solstice The December solstice, also known as the southern solstice, is the solstice that occurs each December – typically on 21 December, but may vary by one day in either direction according to the Gregorian calendar. In the Northern Hemisphere, the ...

(20, 21, 22 or 23 of December). Since prehistory, the summer solstice has been a significant time of year in many cultures, and has been marked by festivals and rituals. Traditionally, in

temperate In geography, the temperate climates of Earth occur in the middle latitudes (approximately 23.5° to 66.5° N/S of the Equator), which span between the tropics and the polar regions of Earth. These zones generally have wider temperature ran ...

regions (especially Europe), the summer solstice is seen as the middle of summer and referred to as

midsummer Midsummer is a celebration of the season of summer, taking place on or near the date of the summer solstice in the Northern Hemisphere; the longest Daytime, day of the year. The name "midsummer" mainly refers to summer solstice festivals of Eu ...

; although today in some countries and calendars it is seen as the beginning of summer. On the summer solstice, Earth's maximum

axial tilt In astronomy, axial tilt, also known as obliquity, is the angle between an object's rotational axis and its orbital axis, which is the line perpendicular to its orbital plane; equivalently, it is the angle between its equatorial plane and orbita ...

toward the Sun is 23.44°. Likewise, the Sun's

declination In astronomy, declination (abbreviated dec; symbol ''δ'') is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle. The declination angle is measured north (positive) or ...

from the

celestial equator The celestial equator is the great circle of the imaginary celestial sphere on the same plane as the equator of Earth. By extension, it is also a plane of reference in the equatorial coordinate system. Due to Earth's axial tilt, the celestial ...

is 23.44°. In areas outside the

tropics The tropics are the regions of Earth surrounding the equator, where the sun may shine directly overhead. This contrasts with the temperate or polar regions of Earth, where the Sun can never be directly overhead. This is because of Earth's ax ...

, the sun reaches its highest

elevation angle The horizontal coordinate system is a celestial coordinate system that uses the observer's local horizon as the fundamental plane to define two angles of a spherical coordinate system: altitude and ''azimuth''. Therefore, the horizontal coordin ...

solar noon Noon (also known as noontime or midday) is 12 o'clock in the daytime. It is written as 12 noon, 12:00 m. (for '' meridiem'', literally 12:00 midday), 12 p.m. (for ''post meridiem'', literally "after midday"), 12 pm, or 12:00 (using a 24-hour clo ...

on the summer solstice. Although the summer solstice is the longest day of the year for that hemisphere, the dates of earliest sunrise and latest sunset vary by a few days. This is because Earth orbits the Sun in an ellipse, and its orbital speed varies slightly during the year.

Culture

There is evidence that the summer solstice has been culturally important since the

Neolithic The Neolithic or New Stone Age (from Ancient Greek, Greek 'new' and 'stone') is an archaeological period, the final division of the Stone Age in Mesopotamia, Asia, Europe and Africa (c. 10,000 BCE to c. 2,000 BCE). It saw the Neolithic Revo ...

era. Many ancient monuments in Europe especially, as well as parts of the Middle East, Asia and the Americas, are aligned with the sunrise or sunset on the summer solstice (see

archaeoastronomy Archaeoastronomy (also spelled archeoastronomy) is the interdisciplinary or multidisciplinary study of how people in the past "have understood the phenomena in the sky, how they used these phenomena and what role the sky played in their cultur ...

). The significance of the summer solstice has varied among cultures, but most recognize the event in some way with

holiday A holiday is a day or other period of time set aside for festivals or recreation. ''Public holidays'' are set by public authorities and vary by state or region. Religious holidays are set by religious organisations for their members and are often ...

festival A festival is an event celebrated by a community and centering on some characteristic aspect or aspects of that community and its religion or cultures. It is often marked as a local or national holiday, Melā, mela, or Muslim holidays, eid. A ...

s, and

ritual A ritual is a repeated, structured sequence of actions or behaviors that alters the internal or external state of an individual, group, or environment, regardless of conscious understanding, emotional context, or symbolic meaning. Traditionally ...

s around that time with themes of fertility. In the

Roman Empire The Roman Empire ruled the Mediterranean and much of Europe, Western Asia and North Africa. The Roman people, Romans conquered most of this during the Roman Republic, Republic, and it was ruled by emperors following Octavian's assumption of ...

, the traditional date of the summer solstice was 24 June. In Germanic-speaking cultures, the time around the summer solstice is called '

'. Traditionally in northern Europe midsummer was reckoned as the night of 23–24 June, with summer beginning on

May Day May Day is a European festival of ancient origins marking the beginning of summer, usually celebrated on 1 May, around halfway between the Northern Hemisphere's March equinox, spring equinox and midsummer June solstice, solstice. Festivities ma ...

. The summer solstice continues to be seen as the middle of summer in many European cultures, but in some cultures or calendars it is seen as summer's beginning. In

Sweden Sweden, formally the Kingdom of Sweden, is a Nordic countries, Nordic country located on the Scandinavian Peninsula in Northern Europe. It borders Norway to the west and north, and Finland to the east. At , Sweden is the largest Nordic count ...

, midsummer is one of the year's major holidays when the country closes down as much as during Christmas.

Observances

;Traditional festivals *

Saint John's Eve Saint John's Eve, starting at sunset on 23 June, is the eve of the Nativity of St John the Baptist, feast day of Saint John the Baptist. This is one of the very few feast days marking a saint's birth, rather than their death. The Gospel of Luke ...

(

Europe Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east ...

), including: **

Golowan Golowan (sometimes also Goluan) is the Cornish language word for the Midsummer celebrations in Cornwall, UK; they were widespread prior to the late 19th century and most popular in the Penwith area and in particular in Penzance. The celebrati ...

(

Cornwall Cornwall (; or ) is a Ceremonial counties of England, ceremonial county in South West England. It is also one of the Celtic nations and the homeland of the Cornish people. The county is bordered by the Atlantic Ocean to the north and west, ...

) ** Jaanipäev (

Estonia Estonia, officially the Republic of Estonia, is a country in Northern Europe. It is bordered to the north by the Gulf of Finland across from Finland, to the west by the Baltic Sea across from Sweden, to the south by Latvia, and to the east by Ru ...

) **

Jāņi Jāņi () is an annual Latvians, Latvian festival celebrating the summer solstice. Although, astronomically the solstice falls on the 21st or 22nd of June, the public holidays—Līgo Day and Jāņi Day—are on the 23rd and 24th of June. The d ...

(

Latvia Latvia, officially the Republic of Latvia, is a country in the Baltic region of Northern Europe. It is one of the three Baltic states, along with Estonia to the north and Lithuania to the south. It borders Russia to the east and Belarus to t ...

) **

Joninės Saint Jonas' Festival, also known as ''Rasos'' (''Dew Holiday''), ''Joninės'', ''Kupolė'', Midsummer Day or Saint John's Day) is a midsummer folk festival celebrated on 24 June all around Lithuania. The celebrations often involve flower wreat ...

(

Lithuania Lithuania, officially the Republic of Lithuania, is a country in the Baltic region of Europe. It is one of three Baltic states and lies on the eastern shore of the Baltic Sea, bordered by Latvia to the north, Belarus to the east and south, P ...

) **

Jónsmessa Jónsmessa (; ), also known as Midsummer Night, is an Icelandic holiday celebrated on June 24 and named after John the Baptist. According to Icelandic folklore, cows gain the powers of speech, seals become human, and it is healthy to roll naked in t ...

(

Iceland Iceland is a Nordic countries, Nordic island country between the Atlantic Ocean, North Atlantic and Arctic Oceans, on the Mid-Atlantic Ridge between North America and Europe. It is culturally and politically linked with Europe and is the regi ...

) **

Juhannus Midsummer is a celebration of the season of summer, taking place on or near the date of the summer solstice in the Northern Hemisphere; the longest day of the year. The name "midsummer" mainly refers to summer solstice festivals of European or ...

(

Finland Finland, officially the Republic of Finland, is a Nordic country in Northern Europe. It borders Sweden to the northwest, Norway to the north, and Russia to the east, with the Gulf of Bothnia to the west and the Gulf of Finland to the south, ...

) *

Kupala Night Kupala Night (also Kupala's Night or just Kupala; Polish: , : , Russian: Ива́н Купа́ла: , Купала: , Ukrainian: Іван Купало: ) is one of the major folk holidays in some of the Slavic countries that coincides with the C ...

(

Slavic peoples The Slavs or Slavic people are groups of people who speak Slavic languages. Slavs are geographically distributed throughout the northern parts of Eurasia; they predominantly inhabit Central Europe, Eastern Europe, Southeast Europe, Southeast ...

) * Shën Gjini–Shën Gjoni, Festa e Malit/Bjeshkës, Festa e Blegtorisë, etc. (

Albanians The Albanians are an ethnic group native to the Balkan Peninsula who share a common Albanian ancestry, Albanian culture, culture, Albanian history, history and Albanian language, language. They are the main ethnic group of Albania and Kosovo, ...

) *

Summer Solstice at Stonehenge Summer Solstice at Stonehenge is an annual event which takes place on the evening of the 20 June and the morning of 21 June. The monument is aligned towards the sunrise on the summer solstice and sunset on the winter solstice. Stonehenge is a pl ...

United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Northwestern Europe, off the coast of European mainland, the continental mainland. It comprises England, Scotlan ...

* Tiregān (

Iran Iran, officially the Islamic Republic of Iran (IRI) and also known as Persia, is a country in West Asia. It borders Iraq to the west, Turkey, Azerbaijan, and Armenia to the northwest, the Caspian Sea to the north, Turkmenistan to the nort ...

) * Xiazhi (China) *

Yhyakh Yhyаkh (, ) is the festival that celebrates the rebirth of nature after a hard winter, the triumph of life, the beginning of a new year in the Sakha Republic. Historic celebration is observed on the 21st June, the day of the summer solstice. ...

(

Yakuts The Yakuts or Sakha (, ; , ) are a Turkic ethnic group native to North Siberia, primarily the Republic of Sakha in the Russian Federation. They also inhabit some districts of the Krasnoyarsk Krai. They speak Yakut, which belongs to the Si ...

) ;Modern observances *

Day of Private Reflection The Day of Private Reflection is a day of remembrance created to acknowledge and reflect upon the conflict in Northern Ireland. It was proposed by Healing Through Remembering, a cross-community organisation devoted to dealing with the legacy of th ...

(

Northern Ireland Northern Ireland ( ; ) is a Countries of the United Kingdom, part of the United Kingdom in the north-east of the island of Ireland. It has been #Descriptions, variously described as a country, province or region. Northern Ireland shares Repub ...

) *

Fête de la Musique The Fête de la Musique, also known in English as Music Day, Make Music Day, or World Music Day, is an annual music celebration that takes place on 21 June. On Music Day, citizens and residents are urged to play music outside in their neighborho ...

, also known as World Music Day *

Fremont Solstice Parade The Fremont Solstice Parade is an annual event that occurs each June in Seattle, Washington (state), Washington. The Parade was founded by Barbara Luecke and Peter Toms in 1989. Luecke and Toms were inspired by the Santa Barbara Summer So ...

(

Fremont, Seattle, Washington Fremont is a neighborhood in the North Central District of Seattle, Washington, United States. Originally a separate city, it was annexed to Seattle in 1891. It is named after Fremont, Nebraska, the hometown of two of its founders: Luther H. Gr ...

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

) *

International Yoga Day The International Day of Yoga is a day in recognition of Yoga that is List of International Days of Yoga, celebrated around the world annually on 21 June following its adoption by the United Nations General Assembly, United Nations in 2014. ...

National Indigenous Peoples Day National Indigenous Peoples Day (; formerly National Aboriginal Day) is a day recognizing and celebrating the cultures and contributions of the First Nations, Inuit, and Métis Indigenous peoples of Canada. The day was first celebrated in 199 ...

(

Canada Canada is a country in North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, making it the world's List of coun ...

) * Santa Barbara Summer Solstice Parade (

Santa Barbara, California Santa Barbara (, meaning ) is a coastal city in Santa Barbara County, California, of which it is also the county seat. Situated on a south-facing section of coastline, the longest such section on the West Coast of the United States excepting A ...

)

In folk music

* "Oh at Ivan, oh at Kupala" ( Ukr. Ой на Івана, ой на Купала) - Ukrainian folk song. * "Kupalinka" - ( Belar. Купалінка) - Belarusian folk song * "There is a lake behind the hill" ( Lith. Už kalnelio ežerėlis) - Lithuanian folk song.

Length of the day on northern summer solstice

The length of day increases from the equator towards the

North Pole The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is the point in the Northern Hemisphere where the Earth's rotation, Earth's axis of rotation meets its surface. It is called the True North Pole to distingu ...

in the Northern Hemisphere in June (around the summer solstice there), but decreases towards the

South Pole The South Pole, also known as the Geographic South Pole or Terrestrial South Pole, is the point in the Southern Hemisphere where the Earth's rotation, Earth's axis of rotation meets its surface. It is called the True South Pole to distinguish ...

in the Southern Hemisphere at the time of the southern winter solstice.

Notes

References

External links

SummerSolstice.uk - Summer Solstice Dates, Information & Community.

{{DEFAULTSORT:Summer solstice December observances June observances International observances

solstice A solstice is the time when the Sun reaches its most northerly or southerly sun path, excursion relative to the celestial equator on the celestial sphere. Two solstices occur annually, around 20–22 June and 20–22 December. In many countries ...

de:Sonnenwende#Sommersonnenwende