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'Dawn' Directed by Rose McGowan
Published: 2015/06/22
Channel: Rose McGowan
DAWN
DAWN
Published: 2017/09/11
Channel: RizonielTV
#9【三人称】ドンピシャのHORIZON ZERO DAWN【モロ出しLIVE】
#9【三人称】ドンピシャのHORIZON ZERO DAWN【モロ出しLIVE】
Published: 2017/11/18
Channel: SANNINSHOW
Nicky, Ricky, Dicky & Dawn Antes y Después 2017
Nicky, Ricky, Dicky & Dawn Antes y Después 2017
Published: 2017/01/08
Channel: Platinium
UNTIL DAWN 2?! | Hidden Agenda #1
UNTIL DAWN 2?! | Hidden Agenda #1
Published: 2017/11/17
Channel: iBerleezy
The Frozen Wilds - Обзор DLC к Horizon Zero Dawn
The Frozen Wilds - Обзор DLC к Horizon Zero Dawn
Published: 2017/11/17
Channel: Уютный подвальчик
Pokemon Ultra Sun and Moon Part 25 - Dawn Wings Necrozma
Pokemon Ultra Sun and Moon Part 25 - Dawn Wings Necrozma
Published: 2017/11/17
Channel: PIMPNITE
ZAYN - Dusk Till Dawn ft. Sia
ZAYN - Dusk Till Dawn ft. Sia
Published: 2017/09/07
Channel: ZaynVEVO
DAWN - Blow
DAWN - Blow
Published: 2014/10/29
Channel: DawnRichardVEVO
Dawn (Go Away) - Frankie Valli and the Four Seasons
Dawn (Go Away) - Frankie Valli and the Four Seasons
Published: 2010/08/06
Channel: wolverine9391
[ LIVE ] Dawn Warrior 138 - 143 | MapleStory TH
[ LIVE ] Dawn Warrior 138 - 143 | MapleStory TH
Published: 2017/11/18
Channel: JayMeander
Horizon: Zero Dawn - The Frozen Wilds DLC #4
Horizon: Zero Dawn - The Frozen Wilds DLC #4
Published: 2017/11/17
Channel: YOGSCAST Hannah
КОТЕЛ. БОСС ГРОМОЗЕВА - Horizon Zero Dawn: The Frozen Wilds
КОТЕЛ. БОСС ГРОМОЗЕВА - Horizon Zero Dawn: The Frozen Wilds
Published: 2017/11/18
Channel: TheBrainDit
Dawn | A Chill Gaming Music Mix | Best of EDM
Dawn | A Chill Gaming Music Mix | Best of EDM
Published: 2017/02/17
Channel: Vibes
Nicky, Ricky, Dicky & Dawn Before And After 2017
Nicky, Ricky, Dicky & Dawn Before And After 2017
Published: 2017/08/09
Channel: Platinium
Stellaris - Let
Stellaris - Let's Play Synthetic Dawn - Part 45
Published: 2017/11/17
Channel: ASpec
Morning Jack™ Zero Dawn(Part 1)
Morning Jack™ Zero Dawn(Part 1)
Published: 2017/11/17
Channel: Previously Recorded
Horizon Zero Dawn: The Frozen Wilds DLC - #15 [Стрим]
Horizon Zero Dawn: The Frozen Wilds DLC - #15 [Стрим]
Published: 2017/11/18
Channel: 7Tiphs – Женский взгляд на игры
Horizon Zero Dawn The Frozen Wilds - Gameplay ITA - Walkthrough #03 - Ourea
Horizon Zero Dawn The Frozen Wilds - Gameplay ITA - Walkthrough #03 - Ourea
Published: 2017/11/17
Channel: QuelTaleAle
NICKY RICKY DICKY ET DAWN AVANT ET APRÈS 2017 (NICKY, RICKY, DICKY & DAWN SÉRIE TÉLÉVISÉE)
NICKY RICKY DICKY ET DAWN AVANT ET APRÈS 2017 (NICKY, RICKY, DICKY & DAWN SÉRIE TÉLÉVISÉE)
Published: 2017/09/29
Channel: Avant et Après
JAEGER - Until Dawn
JAEGER - Until Dawn
Published: 2016/01/14
Channel: Trap Nation
ASOIAF Theories & Discussions: The Dawn Age
ASOIAF Theories & Discussions: The Dawn Age
Published: 2017/11/17
Channel: IdeasOfIceAndFire
"Dusk Till Dawn" - ZAYN ft. Sia (Piano Cover) - Costantino Carrara
"Dusk Till Dawn" - ZAYN ft. Sia (Piano Cover) - Costantino Carrara
Published: 2017/11/16
Channel: Costantino Carrara Music
ZAYN ‒ Dusk Till Dawn (Lyrics / Lyrics Video) ft. Sia
ZAYN ‒ Dusk Till Dawn (Lyrics / Lyrics Video) ft. Sia
Published: 2017/09/07
Channel: Taz Network
Horizon Zero Dawn: The Frozen Wilds #1
Horizon Zero Dawn: The Frozen Wilds #1
Published: 2017/11/17
Channel: Джек Шепард
BATTLES WITH VENOMTUSK! | DAWN OF TITANS LIVE STREAM
BATTLES WITH VENOMTUSK! | DAWN OF TITANS LIVE STREAM
Published: 2017/11/16
Channel: Dawn of Titans
Fleet Upgrade – Stellaris: Synthetic Dawn Gameplay  – Let
Fleet Upgrade – Stellaris: Synthetic Dawn Gameplay – Let's Play Part 10
Published: 2017/11/17
Channel: Aavak
Pokemon Sun and Moon: Ash Vs Misty, May, Dawn, Iris, Serena, Lillie
Pokemon Sun and Moon: Ash Vs Misty, May, Dawn, Iris, Serena, Lillie
Published: 2017/11/09
Channel: BroGamerChannel
'Dawn' An Ambient Mix
Published: 2013/01/01
Channel: MrSuicideSheep
Nicky, Ricky, Dicky & Dawn Antes y Despues 2017
Nicky, Ricky, Dicky & Dawn Antes y Despues 2017
Published: 2017/05/15
Channel: Yozhura18
Spice Dawn: Warmer Wildlife plus add on item!
Spice Dawn: Warmer Wildlife plus add on item!
Published: 2017/11/16
Channel: WicklessWhim
Nicky, Ricky, Dicky & Dawn Antes y Después 2017
Nicky, Ricky, Dicky & Dawn Antes y Después 2017
Published: 2017/01/27
Channel: Azuliso
Stellaris - Let
Stellaris - Let's Play Synthetic Dawn - Part 44
Published: 2017/11/16
Channel: ASpec
ZAYN - Dusk Till Dawn ft. Sia (SING OFF vs. Madison Beer)
ZAYN - Dusk Till Dawn ft. Sia (SING OFF vs. Madison Beer)
Published: 2017/09/25
Channel: Conor Maynard
DAWN - Titans x James Dean
DAWN - Titans x James Dean
Published: 2015/05/27
Channel: DawnRichardVEVO
Tony Orlando & Dawn~Knock Three Times - early rare music video
Tony Orlando & Dawn~Knock Three Times - early rare music video
Published: 2010/11/09
Channel: mezzomanUK
Nicky, Ricky, Dicky & Dawn ★ Before And After
Nicky, Ricky, Dicky & Dawn ★ Before And After
Published: 2017/06/21
Channel: EpicMashups
Until The Dawn - We Are One People (Flite Remix)
Until The Dawn - We Are One People (Flite Remix)
Published: 2017/11/14
Channel: Liquicity
Bringers of the Dawn - Barbara Marciniak - FULL
Bringers of the Dawn - Barbara Marciniak - FULL
Published: 2012/04/27
Channel: Profanumx
Horizon Zero Dawn: The Frozen Wilds - Accolades Trailer | PS4
Horizon Zero Dawn: The Frozen Wilds - Accolades Trailer | PS4
Published: 2017/11/13
Channel: PlayStation
'Dawn' Pt. 3 (An Ambient Mix)
Published: 2016/01/01
Channel: MrSuicideSheep
Until Dawn #17 - "THE END"
Until Dawn #17 - "THE END"
Published: 2017/11/14
Channel: StephenPlays
OFFICIAL DAWN OF EU ARMY: BRUSSELS SIGNS OFF MILITARY PLAN & HAILS HISTORIC DAY WITHOUT UK
OFFICIAL DAWN OF EU ARMY: BRUSSELS SIGNS OFF MILITARY PLAN & HAILS HISTORIC DAY WITHOUT UK
Published: 2017/11/15
Channel: The Next News Network
Soundtrack - Pride and Prejudice - Dawn
Soundtrack - Pride and Prejudice - Dawn
Published: 2008/09/30
Channel: Gurkiball
R.K.M, Ken-Y - Down
R.K.M, Ken-Y - Down
Published: 2009/11/23
Channel: RKMAndKenYVEVO
Hidden Meaning in Dawn of the Planet of the Apes – Earthling Cinema
Hidden Meaning in Dawn of the Planet of the Apes – Earthling Cinema
Published: 2016/07/12
Channel: Wisecrack
♪ Nightcore - Dusk Till Dawn (Sing Off / Switching Vocals)
♪ Nightcore - Dusk Till Dawn (Sing Off / Switching Vocals)
Published: 2017/10/06
Channel: Zen - Kun
Lizzy Greene & Ricardo Hurtado: Behind the Romance | Nicky, Ricky, Dicky & Dawn | Nick
Lizzy Greene & Ricardo Hurtado: Behind the Romance | Nicky, Ricky, Dicky & Dawn | Nick
Published: 2017/05/18
Channel: Nickelodeon
Dawn of Titans: Grulgar Attacks (1.19.1)
Dawn of Titans: Grulgar Attacks (1.19.1)
Published: 2017/11/13
Channel: the_brein
Until Dawn - Game Review
Until Dawn - Game Review
Published: 2015/08/28
Channel: Chris Stuckmann
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WIKIPEDIA ARTICLE

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Dawn is sometimes considered the beginning of morning twilight (as depicted here), sometimes the period of twilight, and sometimes the time of sunrise.
Skyline of Prague at dawn

Dawn (from an Old English verb dagian "to become day") is the time that marks, depending on the specific usage, the beginning of the twilight before sunrise,[1][2] the period of the pre-sunrise twilight or the time of sunrise.[2] When identified as the beginning of or the period of twilight, it is recognized by the presence of weak sunlight, while the Sun itself is still below the horizon.

Types of dawn[edit]

Civil, nautical, and astronomical dawn, when defined as the beginning time of the corresponding twilight.[3]

Different definitions exist as to when dawn begins. The difference between these definitions is dependent on the amount of sunlight that is present in the sky, which can be correlated with the angular distance of the centre of the Sun (degrees) below the horizon, in the morning.

Astronomical dawn[edit]

Astronomical twilight begins when the sky is no longer completely dark after astronomical dawn. This occurs when the Sun is 18 degrees below the horizon in the morning.[4] 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. Astronomical dawn marks the beginning of astronomical twilight, which lasts until nautical dawn.[5]

Nautical dawn[edit]

Nautical twilight begins when there is enough illumination for sailors to distinguish the horizon at sea but the sky is too dark to perform outdoor activities (except with artificial light). Formally, nautical twilight 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.[5][4]

Civil dawn[edit]

Beginning of morning civil twilight in southern California, United States

Civil twilight begins when there is enough light for most objects to be distinguishable, so that some outdoor activities, but not all, can commence. Formally, civil dawn occurs when the Sun is 6 degrees below the horizon in the morning.[4]

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 planets 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.[5]

Effects of latitude[edit]

The duration of the twilight period between first light and sunrise varies greatly depending on the observer's latitude, from a little over twenty minutes in equatorial regions, to many hours in polar regions, to several weeks at the poles.

Equator[edit]

All phases of dawn and dusk are shortest at the equator, where the Sun at equinox rises and sets at a right angle to the horizon; the steps between civil, nautical, and astronomical dawn or dusk correspond to only 24 minutes each. At all places on the earth, dawn and dusk times are fastest around the equinoxes and slowest at the summer and winter solstices.

Polar regions[edit]

As the calendar approaches the summer or winter solstice, the days or nights, respectively, get longer, which can have a potential impact on the time and duration of dawn and dusk. This effect is more pronounced closer to the poles, where the Sun rises at the spring equinox and sets at the autumn equinox, with a long period of dawn/dusk, lasting for a few weeks.

The polar circle (at 66°34′ N or S) 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 the plane of Earth's equator and that of the ecliptic. 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 dawn/dusk; the "darkness of the night" varies greatly in these latitudes.

At latitudes higher than about 60°34, summer nights get no darker than civil dusk or dawn. This period of "bright nights" is longer at higher latitudes.

Example[edit]

Around the summer solstice for instance, 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 all the time 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); more than just the brightest stars are clearly visible in a large majority of the sky.

Mythology and religion[edit]

Many Indo-European mythologies have a dawn goddess, separate from the male Solar deity, her name deriving from PIE *h2ausos-, derivations of which include Greek Eos, Roman Aurora and Indian Ushas. Also related is Lithuanian Aušrinė, and possibly a Germanic *Austrōn- (whence the term Easter). In Sioux mythology, Anpao is an entity with two faces.

The Hindu dawn deity Ushas is female, whereas Surya, the Sun, and Aruṇa, the Sun's charioteer, are male. Ushas is one of the most prominent Rigvedic deities. The time of dawn is also referred to as the Brahmamuhurtham (Brahma is 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. In some parts of India, both Usha and Pratyusha (dusk) are worshiped along with the Sun during the festival of Chhath.

Prime is the fixed time of prayer of the traditional Divine Office (Canonical Hours) in Christian liturgy, said at the first hour of daylight.

In Islam, astronomical dawn (Arabic fajr) is the time of the first prayer of the day, and the beginning of the daily fast during Ramadan.

In Judaism, the question of how to calculate dawn (Hebrew Alos/Alot HaShachar, or Alos/Alot) is posed by the Talmud,[7] 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, 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[edit]

Literature[edit]

  • Homer uses the stock epithet "rosy-fingered Dawn" frequently in The Iliad and The Odyssey.
  • An aubade (Occitan Alba, German Tagelied) is a song about lovers having to separate at daybreak.
  • Aurora Musis amica (Dawn is a friend to the Muse), in Epigrammata Disticha Poetarum Latinorum, Veterum Et Recentum, Nobiliora (1642) by Barthold Nihus[8]

See also[edit]

References[edit]

  1. ^ The Random House College Dictionary, "dawn".
  2. ^ a b A note on sunrise, sunset and twilight times from HM Nautical Almanac Office, The United Kingdom Hydrographic Office. Quoting: There is no general agreement on a precise definition of "dawn"; it is sometimes even identified with sunrise itself. If, however, it is interpreted as the time of "first light", dawn corresponds to a depression between 18° and 12° but it is not possible to be more precise'.
  3. ^ Van Flandern, T.; K. Pulkkinen (1980). "Low precision formulae for planetary positions". Astrophysical Journal Supplement Series. 31 (3): 391. Bibcode:1979ApJS...41..391V. doi:10.1086/190623. 
  4. ^ a b c National Oceanic and Atmospheric Administration. "Astronomical Terms". 
  5. ^ a b c https://www.timeanddate.com/astronomy/dawn.html
  6. ^ "New Dawn at La Silla". ESO Picture of the Week. European Southern Observatory. Retrieved 27 February 2015. 
  7. ^ Pesachim 94a
  8. ^ Nihus, Barthold (1642). Epigrammata disticha. Johannes Kinckius. 

External links[edit]

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