Dawn is the time that marks the beginning of

twilight Twilight is light produced by sunlight scattering in the upper atmosphere, when the Sun is below the horizon, which illuminates the lower atmosphere and the Earth's surface. The word twilight can also refer to the periods of time when this i ...

before

sunrise Sunrise (or sunup) is the moment when the upper rim of the Sun appears on the horizon in the morning. The term can also refer to the entire process of the solar disk crossing the horizon and its accompanying atmospheric effects. Terminology A ...

. It is recognized by the

appearance Appearance may refer to: * Visual appearance, the way in which objects reflect and transmit light * Human physical appearance, what someone looks like * ''Appearances'' (film), a 1921 film directed by Donald Crisp * Appearance (philosophy), or p ...

of indirect sunlight being scattered in

Earth's atmosphere The atmosphere of Earth is the layer of gases, known collectively as air, retained by Earth's gravity that surrounds the planet and forms its planetary atmosphere. The atmosphere of Earth protects life on Earth by creating pressure allowing fo ...

, when the centre of the

Sun The Sun is the star at the center of the Solar System. It is a nearly perfect ball of hot plasma, heated to incandescence by nuclear fusion reactions in its core. The Sun radiates this energy mainly as light, ultraviolet, and infrared radi ...

's disc has reached 18° below the observer's horizon. This

morning Morning is the period from sunrise to noon. There are no exact times for when morning begins (also true of evening and night) because it can vary according to one's lifestyle and the hours of daylight at each time of year. However, morning s ...

twilight period will last until sunrise (when the Sun's upper limb breaks the horizon), when

direct sunlight Direct may refer to: Mathematics * Directed set, in order theory * Direct limit of (pre), sheaves * Direct sum of modules, a construction in abstract algebra which combines several vector spaces Computing * Direct access (disambiguation), a ...

outshines the diffused light. Twilight-dawn subcategories

Etymology

"Dawn" derives from the

Old English Old English (, ), or Anglo-Saxon, is the earliest recorded form of the English language, spoken in England and southern and eastern Scotland in the early Middle Ages. It was brought to Great Britain by Anglo-Saxon settlers in the mid-5th c ...

verb ''dagian'', "to become day".

Types of dawn

Dawn begins with the first sight of lightness in the morning, and continues until the Sun breaks the horizon. This morning twilight before sunrise is divided into three categories depending on the amount of sunlight that is present in the sky, which is determined by the angular distance of the centre of the Sun ( degrees below the horizon) in the

. These categories are ''astronomical'', ''nautical'', and ''civil dawn''.

Astronomical dawn

Astronomical dawn begins when the Sun is 18 degrees below the horizon in the morning. Astronomical twilight follows instantly until the Sun is 12 degrees below the horizon. At this point a very small portion of the Sun's rays illuminate the sky and the fainter stars begin to disappear. Astronomical dawn is often indistinguishable from night, especially in areas with

light pollution Light pollution is the presence of unwanted, inappropriate, or excessive use of artificial Visible spectrum, lighting. In a descriptive sense, the term ''light pollution'' refers to the effects of any poorly implemented lighting, during the day ...

. Astronomical dawn marks the beginning of astronomical twilight, which lasts until nautical dawn.

Nautical dawn

Nautical twilight begins when there is enough illumination for sailors to distinguish the horizon at sea but the sky being too dark to perform outdoor activities. Formally, it begins when the Sun is 12 degrees below the horizon in the morning. The sky becomes light enough to clearly distinguish it from land and water. Nautical dawn marks the start of nautical twilight, which lasts until civil dawn.

Civil dawn

Civil dawn begins when there is enough light for most objects to be distinguishable, so that some outdoor activities can commence. Formally, it occurs when the

is 6 degrees below the horizon in the morning. If the sky is clear, it is blue colored, and if there is some cloud or haze, there can be bronze, orange and yellow colours. Some bright stars and

planet A planet is a large, rounded astronomical body that is neither a star nor its remnant. The best available theory of planet formation is the nebular hypothesis, which posits that an interstellar cloud collapses out of a nebula to create a you ...

s such as Venus and Jupiter are visible to the naked eye at civil dawn. This moment marks the start of civil twilight, which lasts until sunrise.

Effects of latitude

The duration of the

period (e.g. between astronomical dawn and

) varies greatly depending on the observer's

latitude In geography, latitude is a coordinate that specifies the north– south position of a point on the surface of the Earth or another celestial body. Latitude is given as an angle that ranges from –90° at the south pole to 90° at the north pol ...

: from a little over 70 minutes at the Equator, to many hours in the polar regions.

The Equator

The period of twilight is shortest at the Equator, where the

equinox A solar equinox is a moment in time when the Sun crosses the Earth's equator, which is to say, appears directly above the equator, rather than north or south of the equator. On the day of the equinox, the Sun appears to rise "due east" and se ...

Sun rises due east and sets due west, at a right angle to the horizon. Each stage of twilight (civil, nautical, and astronomical) lasts only 24 minutes. From anywhere on Earth, the twilight period is shortest around the equinoxes and longest on the

solstice A solstice is an event that occurs when the Sun appears to reach its most northerly or southerly excursion relative to the celestial equator on the celestial sphere. Two solstices occur annually, around June 21 and December 21. In many countr ...

Polar regions

Daytime becomes longer as the summer solstice approaches, while

night Night (also described as night time, unconventionally spelled as "nite") is the period of ambient darkness from sunset to sunrise during each 24-hour day, when the Sun is below the horizon. The exact time when night begins and ends depends ...

time gets longer as the

winter solstice The winter solstice, also called the hibernal solstice, occurs when either of Earth's poles reaches its maximum tilt away from the Sun. This happens twice yearly, once in each hemisphere (Northern and Southern). For that hemisphere, the winter ...

approaches. This can have a potential impact on the times and durations of dawn and dusk. This effect is more pronounced closer to the poles, where the Sun rises at the vernal equinox and sets at the autumn equinox, with a long period of twilight, lasting for a few weeks. The

polar circle A polar circle is a geographic term for a conditional circular line (arc) referring either to the Arctic Circle or the Antarctic Circle. These are two of the keynote circles of latitude (parallels). On Earth, the Arctic Circle is currently d ...

(at 66°34′ north or south) is defined as the lowest latitude at which the Sun does not set at the summer solstice. Therefore, the angular radius of the polar circle is equal to the angle between Earth's equatorial plane and the

ecliptic The ecliptic or ecliptic plane is the orbital plane of the Earth around the Sun. From the perspective of an observer on Earth, the Sun's movement around the celestial sphere over the course of a year traces out a path along the ecliptic agains ...

plane. This period of time with no sunset lengthens closer to the pole. Near the summer solstice, latitudes higher than 54°34′ get no darker than nautical twilight; the "darkness of the night" varies greatly at these latitudes. At latitudes higher than about 60°34, summer nights get no darker than civil twilight. This period of "bright nights" is longer at higher latitudes.

Example

Around the summer solstice, Glasgow, Scotland at 55°51′ N, and Copenhagen, Denmark at 55°40′ N, get a few hours of "night feeling". Oslo, Norway at 59°56′ N, and Stockholm, Sweden at 59°19′ N, seem very bright when the Sun is below the horizon. When the Sun gets 9.0 to 9.5 degrees below the horizon (at summer solstice this is at latitudes 57°30′–57°00′), the zenith gets dark even on cloud-free nights (if there is no full moon), and the brightest stars are clearly visible in a large majority of the sky.

Mythology and religion

In Islam,

Zodiacal Light The zodiacal light (also called false dawn when seen before sunrise) is a faint glow of diffuse sunlight scattered by interplanetary dust. Brighter around the Sun, it appears in a particularly dark night sky to extend from the Sun's direction ...

(or "false dawn") is referred to as False Morning (''Subhe-Kazeb'',

Persian Persian may refer to: * People and things from Iran, historically called ''Persia'' in the English language ** Persians, the majority ethnic group in Iran, not to be conflated with the Iranic peoples ** Persian language, an Iranian language of the ...

''صبح کاذب'') and Astronomical dawn is called ''Sahar'' (''سحر'') or True Morning (''Subhe-Sadeq,''

''صبح صادق''), and it is the time of first prayer of the day, and the beginning of the daily fast during Ramadan. Many Indo-European mythologies have a

dawn goddess A dawn god or goddess is a deity in a polytheistic religious tradition who is in some sense associated with the dawn. These deities show some relation with the morning, the beginning of the day, and, in some cases, become syncretized with similar ...

, separate from the male Solar deity, her name deriving from PIE '' *h₂ausos-'', derivations of which include Greek

Eos In ancient Greek mythology and religion, Eos (; Ionic and Homeric Greek ''Ēṓs'', Attic ''Héōs'', "dawn", or ; Aeolic ''Aúōs'', Doric ''Āṓs'') is the goddess and personification of the dawn, who rose each morning from her home at ...

, Roman

Aurora An aurora (plural: auroras or aurorae), also commonly known as the polar lights, is a natural light display in Earth's sky, predominantly seen in high-latitude regions (around the Arctic and Antarctic). Auroras display dynamic patterns of bri ...

and Indian

Ushas Ushas (Vedic Sanskrit: / ') is a Vedic goddess of dawn in Hinduism. She repeatedly appears in the Rigvedic hymns, states David Kinsley, where she is "consistently identified with dawn, revealing herself with the daily coming of light to the worl ...

. Also related is Lithuanian Aušrinė, and possibly a Germanic '' *Austrōn-'' (whence the term ''

Easter Easter,Traditional names for the feast in English are "Easter Day", as in the '' Book of Common Prayer''; "Easter Sunday", used by James Ussher''The Whole Works of the Most Rev. James Ussher, Volume 4'') and Samuel Pepys''The Diary of Samuel ...

''). In Sioux mythology,

Anpao In Sioux mythology (a Native American mythological tradition that includes Lakota mythology), Anpao (Lakota: ''Aŋpáo''), or Anp, is a spirit with two faces that represents the dawn. Anpao dances with Han, a primordial spirit of darkness, to ens ...

is an entity with two faces. The

Hindu Hindus (; ) are people who religiously adhere to Hinduism. Jeffery D. Long (2007), A Vision for Hinduism, IB Tauris, , pages 35–37 Historically, the term has also been used as a geographical, cultural, and later religious identifier for ...

dawn deity

is female, whereas Surya, the Sun, and Aruṇa, the Sun's charioteer, are male.

is one of the most prominent

Rigvedic deities Rigvedic deities are deities mentioned in the sacred texts of Rigveda, the principal text of the historical Vedic religion of the Vedic period (1500–500 BCE). There are 1,028 hymns (sūkta) in the Rigveda. Most of these hymns are dedicated to ...

. The time of dawn is also referred to as the Brahmamuhurtham (

Brahma Brahma ( sa, ब्रह्मा, Brahmā) is a Hindu god, referred to as "the Creator" within the Trimurti, the trinity of supreme divinity that includes Vishnu, and Shiva.Jan Gonda (1969)The Hindu Trinity Anthropos, Bd 63/64, H 1/2, pp. 21 ...

is the God of creation and muhurtham is a Hindu unit of time), and is considered an ideal time to perform spiritual activities, including meditation and

yoga Yoga (; sa, योग, lit=yoke' or 'union ) is a group of physical, mental, and spiritual practices or disciplines which originated in ancient India and aim to control (yoke) and still the mind, recognizing a detached witness-consci ...

. In some parts of

India India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the so ...

, both Usha and Pratyusha (dusk) are worshiped along with the Sun during the festival of Chhath. Jesus in the Bible is often symbolized by dawn in the morning, also when Jesus rose on the third day it happened during the morning.

Prime A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways ...

is the fixed time of prayer of the traditional Divine Office (Canonical Hours) in Christian liturgy, said at the first hour of daylight. Associated with Jesus, in Christianity, Christian burials take place in the direction of dawn. In

Judaism Judaism ( he, ''Yahăḏūṯ'') is an Abrahamic, monotheistic, and ethnic religion comprising the collective religious, cultural, and legal tradition and civilization of the Jewish people. It has its roots as an organized religion in t ...

, the question of how to calculate dawn (

Hebrew Hebrew (; ; ) is a Northwest Semitic language of the Afroasiatic language family. Historically, it is one of the spoken languages of the Israelites and their longest-surviving descendants, the Jews and Samaritans. It was largely preserved ...

Alos/ HaShachar, or Alos/) is posed by the

Talmud The Talmud (; he, , Talmūḏ) is the central text of Rabbinic Judaism and the primary source of Jewish religious law ('' halakha'') and Jewish theology. Until the advent of modernity, in nearly all Jewish communities, the Talmud was the ce ...

, as it has many ramifications for Jewish law (such as the possible start time for certain daytime commandments, like prayer). The simple reading of the Talmud is that dawn takes place 72 minutes before sunrise. Others, including the Vilna Gaon, have the understanding that the Talmud's timeframe for dawn was referring specifically to an equinox day in

Mesopotamia Mesopotamia ''Mesopotamíā''; ar, بِلَاد ٱلرَّافِدَيْن or ; syc, ܐܪܡ ܢܗܪ̈ܝܢ, or , ) is a historical region of Western Asia situated within the Tigris–Euphrates river system, in the northern part of the ...

, and is therefore teaching that dawn should be calculated daily as commencing when the Sun is 16.1 degrees below the horizon. The longstanding practice among most Sephardic Jews is to follow the first opinion, while many Ashkenazi Jews follow the latter view.

Dawn in art

File:L'Aurore by William-Adolphe Bouguereau - BMA.jpg, ''L'Aurore'' by

William-Adolphe Bouguereau William-Adolphe Bouguereau (; 30 November 1825 – 19 August 1905) was a French academic painter. In his realistic genre paintings, he used mythological themes, making modern interpretations of classical subjects, with an emphasis on the female ...

File:Guillaume Vogels - L'aurore, Mer du Nord.jpg, Mer du Nord'' by Guillaume Vogels

Literature

Homer Homer (; grc, Ὅμηρος , ''Hómēros'') (born ) was a Greek poet who is credited as the author of the ''Iliad'' and the ''Odyssey'', two epic poems that are foundational works of ancient Greek literature. Homer is considered one of the ...

uses the stock epithet "rosy-fingered Dawn" frequently in ''

The Iliad The ''Iliad'' (; grc, Ἰλιάς, Iliás, ; "a poem about Ilium") is one of two major ancient Greek epic poems attributed to Homer. It is one of the oldest extant works of literature still widely read by modern audiences. As with the '' Ody ...

'' and ''

The Odyssey The ''Odyssey'' (; grc, Ὀδύσσεια, Odýsseia, ) is one of two major ancient Greek epic poems attributed to Homer. It is one of the oldest extant works of literature still widely read by modern audiences. As with the ''Iliad'', th ...

'' *An

aubade An aubade is a morning love song (as opposed to a serenade, intended for performance in the evening), or a song or poem about lovers separating at dawn. It has also been defined as "a song or instrumental composition concerning, accompanying, or ev ...

(Occitan

Alba ''Alba'' ( , ) is the Scottish Gaelic name for Scotland. It is also, in English language historiography, used to refer to the polity of Picts and Scots united in the ninth century as the Kingdom of Alba, until it developed into the Kingdom ...

, German

Tagelied The Tagelied (''dawn song'') is a particular form of mediaeval German-language lyric, taken and adapted from the Provençal troubadour tradition (in which it was known as the alba) by the German Minnesinger. Often in three verses, it depicts the ...

) is a song about lovers having to separate at daybreak *''Aurora Musis amica'' (Dawn is a friend to the

Muse In ancient Greek religion and mythology, the Muses ( grc, Μοῦσαι, Moûsai, el, Μούσες, Múses) are the inspirational goddesses of literature, science, and the arts. They were considered the source of the knowledge embodied in the ...

), in ''Epigrammata Disticha Poetarum Latinorum, Veterum Et Recentum, Nobiliora (1642)'' by

Barthold Nihus Barthold Nihus, OPraem (born on 7 February 1590, Holtorf, Hanover, now Germany – died on 10 March 1657, Erfurt, now Germany) was a Catholic convert, a German Catholic bishop and controversialist. He was born in the Duchy of Brunswick-Lüneburg. ...

*''The Dawn'', volume 1 on ''Jean-Christophe'' written by

Romain Rolland Romain Rolland (; 29 January 1866 – 30 December 1944) was a French dramatist, novelist, essayist, art historian and mystic who was awarded the Nobel Prize for Literature in 1915 "as a tribute to the lofty idealism of his literary production a ...

*''Dawn'', a novel written by

Henry Rider Haggard Sir Henry Rider Haggard (; 22 June 1856 – 14 May 1925) was an English writer of adventure fiction romances set in exotic locations, predominantly Africa, and a pioneer of the lost world literary genre. He was also involved in land reform t ...

, published in 1884 *"Dawn", a poem written by Rupert Brooke published in ''The Collected Poems of Rupert Brooke'' *"Dawn", a poem written by

Richard Aldington Richard Aldington (8 July 1892 – 27 July 1962), born Edward Godfree Aldington, was an English writer and poet, and an early associate of the Imagist movement. He was married to the poet Hilda Doolittle (H. D.) from 1911 to 1938. His 50-year w ...

*"Dawn", a poem written by

Emily Dickinson Emily Elizabeth Dickinson (December 10, 1830 – May 15, 1886) was an American poet. Little-known during her life, she has since been regarded as one of the most important figures in American poetry. Dickinson was born in Amherst, Massac ...

*"Dawn", a poem written by Francis Ledwidge *"Dawn", a poem written by

John Masefield John Edward Masefield (; 1 June 1878 – 12 May 1967) was an English poet and writer, and Poet Laureate of the United Kingdom, Poet Laureate from 1930 until 1967. Among his best known works are the children's novels ''The Midnight Folk'' and ...

*"Dawn", a poem written by

William Carlos Williams William Carlos Williams (September 17, 1883 – March 4, 1963) was an American poet, writer, and physician closely associated with modernism and imagism. In addition to his writing, Williams had a long career as a physician practicing both pedia ...

Williams, W. C.
Dawn
poetry.com, accessed 10 September 2022 *''I Greet the Dawn: Poems'', a book of poetry written by

Paul Laurence Dunbar Paul Laurence Dunbar (June 27, 1872 – February 9, 1906) was an American poet, novelist, and short story writer of the late 19th and early 20th centuries. Born in Dayton, Ohio, to parents who had been enslaved in Kentucky before the American C ...

, published January 1, 1978 by

Atheneum Books Atheneum Books was a New York City publishing house established in 1959 by Alfred A. Knopf, Jr., Simon Michael Bessie and Hiram Haydn. Simon & Schuster has owned Atheneum properties since its acquisition of Macmillan in 1994 and it created Athen ...

*"Dawn", a four-line poem from ''Lyrics of Lowly Life'', a book of poetry written by

, originally published in 1896. This poem was published again in ''The Complete Poems of Paul Laurence Dunbar'', the 1913 collection of his work-- ::''An angel, robed in spotless white,'' ::''Bent down and kissed the sleeping Night.'' ::''Night woke to blush; the sprite was gone.'' ::''Men saw the blush and called it Dawn.'' :::::-''Dawn'' by Paul Laurence Dunbar

References

External links

Worldwide timetable for dawn time calculation
{{Parts of a day Earth phenomena Parts of a day