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The Twilight Hours | Levitt Shell Sioux Falls
After astronomical dusk and before astronomical dawn, the sky is not illuminated by the sun. However, some critical observations, such as of faint diffuse items such as nebulae and galaxies , may require observation beyond the limit of astronomical twilight. Theoretically, the faintest stars detectable by the naked eye those of approximately the sixth magnitude will become visible in the evening at astronomical dusk , and become invisible at astronomical dawn. However, in other places, especially those with skyglow , astronomical twilight may be almost indistinguishable from night.
In the evening, even when astronomical twilight has yet to end and in the morning when astronomical twilight has already begun, most casual observers would consider the entire sky fully dark. Because of light pollution , observers in some localities, generally in large cities, may never have the opportunity to view even fourth-magnitude stars, irrespective of the presence of any twilight at all, and to experience truly dark skies.
This also occurs for most observers at higher latitudes on many dates throughout the year, except those around the summer solstice. These latitudes include many densely populated regions of the Earth, including the entire United Kingdom and other countries in northern Europe. In Arctic and Antarctic latitudes in wintertime, the polar night only rarely produces complete darkness for 24 hours each day. This can occur only at locations within 5.
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At all other latitudes and dates, the polar night includes a daily period of twilight, when the Sun is not far below the horizon. Around winter solstice, when the solar declination changes slowly, complete darkness lasts several weeks at the Pole itself, e. At latitudes within 9 degrees of either Pole, as the sun's angular elevation difference is less than 18 degrees, twilight can last for the entire 24 hours.
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This occurs for one day at latitudes near 9 degrees from the Pole and extends up to several weeks the further towards the Pole one goes. The only permanent settlement to experience this condition is Alert, Nunavut , Canada, where it occurs for a week in late February, and again in late October. The duration of twilight depends on the latitude and the time of the year. This angle of the sun's motion with respect to the horizon changes with latitude as well as the time of year affecting the angle of the Earth's axis with respect to the sun.
Twilight - Wikipedia
At Greenwich, England At the equator , conditions can go from day to night in as little as 20—25 minutes. This is true because at low latitudes the sun's apparent movement is perpendicular to the observer's horizon. But at the poles, civil twilight can be as long as 2—3 weeks. In the Arctic and Antarctic regions, twilight if there is any can last for several hours.
There is no astronomical twilight at the poles near the winter solstice for about 74 days at the North Pole and about 80 days at the South Pole. As one gets closer to the Arctic and Antarctic circles, the sun's disk moves toward the observer's horizon at a lower angle. The observer's earthly location will pass through the various twilight zones less directly, taking more time.
Within the polar circles , twenty-four-hour daylight is encountered in summer, and in regions very close to the poles, twilight can last for weeks on the winter side of the equinoxes. Outside the polar circles, where the angular distance from the polar circle is less than the angle which defines twilight see above , twilight can continue through local midnight near the summer solstice. The precise position of the polar circles, and the regions where twilight can continue through local midnight, varies slightly from year to year with Earth's axial tilt.
The lowest latitudes at which the various twilights can continue through local midnight are approximately These are the largest cities of their respective countries where the various twilights can continue through local solar midnight:. Although Helsinki, Oslo, Stockholm, Tallinn, and Saint Petersburg also enter into nautical twilight after sunset, they do have noticeably lighter skies at night during the summer solstice than other locations mentioned in their category above, because they do not go far into nautical twilight.
A white night is a night with only civil twilight which lasts from sunset to sunrise. At the winter solstice within the polar circle, twilight can extend through solar noon at latitudes below Twilight on Mars is longer than on Earth, lasting for up to two hours before sunrise or after sunset. Dust high in the atmosphere scatters light to the night side of the planet. Similar twilights are seen on Earth following major volcanic eruptions. Forgot to save your resume? Use for to create your resume on Indeed and apply to jobs quicker.
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