Eclipses of the Sun happen once or twice a year.
But since the path of totality is so small it is very unlikely that it will cross you home. So people often travel half way around the world just to see a total solar eclipse. To stand in the shadow of the Moon is an awesome experience. For a few precious minutes it gets dark in the middle of the day. The stars come out. And you can see the solar corona.
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It is well worth a major journey. The composition of the solar wind also appears to differ in the polar regions. The solar wind has large effects on the tails of comets and even has measurable effects on the trajectories of spacecraft. Nor is the amount of sunspot activity. There was a period of very low sunspot activity in the latter half of the 17th century called the Maunder Minimum.
It coincides with an abnormally cold period in northern Europe sometimes known as the Little Ice Age. The Sun is about 4.
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Since its birth it has used up about half of the hydrogen in its core. But eventually it will run out of hydrogen fuel. Fairbanks is at about This means that solar culmination occurs at about pm instead of at 12 noon. If a precise moment for the genuine "midnight sun" is required, the observer's longitude , the local civil time and the equation of time must be taken into account. The moment of the Sun's closest approach to the horizon coincides with its passing due north at the observer's position, which occurs only approximately at midnight in general.
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Each degree of longitude east of the Greenwich meridian makes the vital moment exactly 4 minutes earlier than midnight as shown on the clock, while each hour that the local civil time is ahead of coordinated universal time UTC, also known as GMT makes the moment an hour later. These two effects must be added.
Furthermore, the equation of time which depends on the date must be added: a positive value on a given date means that the Sun is running slightly ahead of its average position, so the value must be subtracted. The equation of time at that date is Therefore, the sun's lowest elevation occurs - On other nearby dates the only thing different is the equation of time, so this remains a reasonable estimate for a considerable period.
The Sun's altitude remains within half a degree of the minimum of about 5 degrees for about 45 minutes either side of this time. White Nights have become a common symbol of Saint Petersburg, Russia , where they occur from about 11 June to 2 July,  and the last 10 days of June are celebrated with cultural events known as the White Nights Festival. The northernmost tip of Antarctica also experiences white nights, but near the summer solstice Southern Hemisphere.
Even though at the Arctic Circle the center of the Sun is, per definition and without refraction by the atmosphere, only visible during one summer night, some part of the midnight sun is visible at the Arctic Circle from approximately 12 June until 1 July.
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This period extends as one travels north: At Cape Nordkinn, Norway , the northernmost point of Continental Europe , the midnight sun lasts approximately from 14 May to 29 July. On the Svalbard archipelago farther north, it lasts from 20 April to 22 August. From Wikipedia, the free encyclopedia.
Calculation of sun’s position in the sky for each location on the earth at any time of day [en]
Natural phenomenon when daylight lasts for more than 24 hours, occurring only inside or close to the polar circles. For other uses, see Midnight sun disambiguation. This article needs additional citations for verification.
Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Main article: White Night festivals. Environment portal.
The Science Museum Group
Earth Phenomena Planetary Science". Retrieved Haugan, ed. Parts of a day. Categories : Earth phenomena Geography of the Arctic Sun.
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