Dawn
Dawn is the time that marks the beginning of
Etymology
"Dawn" derives from the Old English 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. The morning twilight is divided in three phases, which are determined by the angular distance of the centre of the Sun (degrees below the horizon) in the morning. These are astronomical, nautical and civil twilight.
Astronomical dawn
Astronomical dawn begins when the center of the Sun is 18 degrees below the horizon in the morning. Astronomical twilight follows instantly until the center of the Sun is 12 degrees below the horizon.[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
Nautical twilight begins when there is enough light for sailors to distinguish the horizon at sea, but the sky is still too dark to perform outdoor activities. It begins when the center of the Sun is 12 degrees below the horizon in the morning. Nautical dawn marks the start of nautical twilight, which lasts until civil dawn.[5][4]
Civil dawn
Civil dawn begins when there is enough light for most objects to be distinguishable, so that some outdoor activities can commence. It occurs when the center of the Sun is 6 degrees below the horizon in the morning.[4]
When the sky is clear, it is blue colored, and if there are clouds or haze, bronze, orange and yellow colors are seen. Some bright stars and planets such as Venus and Jupiter are still visible to the naked eye at civil dawn. This moment marks the start of civil twilight, which lasts until sunrise.[5]
Effects of latitude
This section needs additional citations for verification. (July 2022) |
The duration of the morning
The Equator
The period of twilight is shortest at the Equator, where the equinox 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 solstices.[citation needed]
Polar regions
Daytime becomes longer as the summer solstice approaches, while nighttime gets longer as the winter solstice 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.[citation needed]
The
Near the summer solstice, latitudes higher than about 54°34' get no darker than nautical twilight; the "darkness of the night" varies greatly at these latitudes.[citation needed]
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.[citation needed]
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.[citation needed]
Mythology and religion
In
Many
In
The
In
In art
-
L'Aurore by William-Adolphe Bouguereau, 1881
-
L'aurore, Mer du Nord by Guillaume Vogels, c. 1877
In literature
- 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[11]
- The Dawn, volume 1 on Jean-Christophe written by Romain Rolland
- Dawn, a novel written by Henry Rider Haggard, 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
- "Dawn", a poem written by Emily Dickinson
- "Dawn", a poem written by Francis Ledwidge
- "Dawn", a poem written by John Masefield
- "Dawn", a poem written by William Carlos Williams[12]
- I Greet the Dawn: Poems, a book of poetry written by Paul Laurence Dunbar, published January 1, 1978, by Atheneum Books
- "Dawn", a four-line poem from Lyrics of Lowly Life, a book of poetry written by Paul Laurence Dunbar, 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
- Men saw the blush and called it Dawn.
See also
References
- ^ "The different types of twilight". timeanddate.com.
- doi:10.1086/190623.
- ^ "New Dawn at La Silla". ESO Picture of the Week. European Southern Observatory. Retrieved 27 February 2015.
- ^ a b c National Oceanic and Atmospheric Administration. "Astronomical Terms".
- ^ a b c "Dawn – Definition and Meaning".
- ^ "For how long does the twilight last?". stjerneskinn.com. Retrieved 2023-09-08.
- ^ Meeus, Jean. Astronomical Algorithms. pp. 101–104.
- ^ "مراد از صبح(فجر) صادق و کاذب چیست؟ - گنجینه پاسخ ها". اسلام کوئست - مرجعی برای پاسخگویی به سوالات دینی، اعتقادی و شرعی (in Persian). Retrieved 2022-11-04.
- ^ "46 Bible verses about Dawn". bible.knowing-jesus.com. Retrieved 2021-11-06.
- ^ Pesachim 94a
- ^ Nihus, Barthold (1642). Epigrammata disticha. Johannes Kinckius.
- ^ Williams, W. C., Dawn, poetry.com, accessed 10 September 2022