midnight sun


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midnight sun,

phenomenon in which the sun remains visible in the sky continuously for 24 hr or longer, occurring only in the polar regions. The midnight sun is due to the fact that the plane of the earth's equator is tilted about 23 1-2° to the plane of the eclipticecliptic
, the great circle on the celestial sphere that lies in the plane of the earth's orbit (called the plane of the ecliptic). Because of the earth's yearly revolution around the sun, the sun appears to move in an annual journey through the heavens with the ecliptic as its
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 (the apparent path of the sun through the sky). Thus, at the summer solsticesolstice
[Lat.,=sun stands still], in astronomy, either of the two points on the ecliptic that lie midway between the equinoxes (separated from them by an angular distance of 90°).
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 (about June 22), the sun is still visible on the horizon at midnight at all points along the Arctic CircleArctic Circle,
imaginary circle on the surface of the earth at 66 1-2°N latitude, i.e., 23 1-2° south of the North Pole. It marks the northernmost point at which the sun can be seen at the winter solstice (about Dec.
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, 23 1-2° of latitude from the North Pole. At points north of the Arctic Circle, the midnight sun is visible for longer than one day, the North Pole having a full six months of continuous sun from the vernal equinoxequinox
, either of two points on the celestial sphere where the ecliptic and the celestial equator intersect. The vernal equinox, also known as "the first point of Aries," is the point at which the sun appears to cross the celestial equator from south to north.
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 (about Mar. 21) to the autumnal equinox (about Sept. 23). In the south polar regions the midnight sun is visible along the Antarctic CircleAntarctic Circle,
imaginary circle on the surface of the earth at 66 1-2°S lat., i.e., 23 1-2° north of the South Pole. It marks the southernmost point at which the sun can be seen at the winter solstice (about June 22) and the northernmost point of the southern polar
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 at the winter solstice (about Dec. 22) and south of the Antarctic Circle for longer periods.

midnight sun

[′mid‚nīt ′sən]
(astronomy)
The sun when it is visible at midnight; occurs during the summer in high latitudes, poleward of the circle at which the latitude is approximately equal to the polar distance of the sun.

midnight sun

the sun visible at midnight during local summer inside the Arctic and Antarctic circles
References in periodicals archive ?
The midnight sun is a phenomenon common to the Nordic landscape occurring during the summer - when the sun can be seen at midnight.
In the winter the northernmost parts of Norway tempt travellers with the Northern Lights but during the summer months the Midnight Sun is a unique nature experience you don't want to miss, says the director of tourism in Norway, Per-Arne Tuftin.
Midnight Sun is really best avoided; there's no good reason why a grown-up should spend money on this.
Before I heard Midnight Sun I knew that The GOASTT is the endeavour of John Lennon and Yoko Ono's son, Sean, and his partner Charlotte Kemp Muhl, who's a model and musician.
We look forward to working with TOTE on converting the Midnight Sun and North Star to LNG so that they can realize the benefits that LNG as a marine fuel can provide, says Bjorn Rosengren, President & CEO of Wartsila Corporation.
THE Lofoten Islands are a large group of islands located on a rocky peninsular inside the Arctic Circle and is a great location to experience the midnight sun during Norway's summer months.
Between late May and the end of July, the city experiences the phenomenon of "midnight sun," meaning the sun doesn't set for more than 60 days.
He commands Emily and her boyfriend Aaron to travel to the far north and find a mountain by a lake in the Land of the Midnight Sun. They are given a top secret quest and ordered not even to tell their families where they are going.
Mary Albanese (author); MIDNIGHT SUN, ARCTIC MOON; Epicenter Press (Nonfiction: Autobiography & Memoir) 14.95 ISBN: 9781935347170
The area can be defined as north of the Arctic Circle (66[degrees] 33'N), the approximate limit of the midnight sun and the polar night.
JOIN the Marco Polo on a 12-night voyage to the land of the Vikings and the Midnight Sun, to the far north of Norway, sailing from Tilbury on June 13.
The concerts will feature unseen film from the lands of the midnight sun on a 32ft wide, high definition screen raised above the orchestra and a score specially arranged and conducted by John Harle.