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Starting at approximately the end of November to mid-January, at around the 69th parallel north, the Inuit never see the sun. During this time, though dark, the sky is often obscured by weather conditions like blowing snow or cloud cover. Then, for 10 weeks beginning in mid-May, the sun never sets. This also means that in the spring, summer ...
These glass filters can crack unexpectedly from overheating when the telescope is pointed at the Sun, and retinal damage can occur faster than the observer can move the eye from the eyepiece." [ 3 ] Solar filters are used to safely observe and photograph the Sun , which despite being white, may appear as a yellow-orange disk.
With a conventional telescope, an extremely dark filter at the opening of the primary tube is used to reduce the light of the Sun to tolerable levels. Since the full available spectrum is observed, this is known as "white-light" viewing, and the opening filter is called a "white-light filter".
The northernmost town in America is about to experience several weeks of darkness. After getting 30 minutes of daylight, the town of Utqiaġvik, Alaska – formerly known as Barrow – saw its ...
A European spacecraft is showing us how dynamic the Sun is with newly released images, the highest-resolution images of our star's surface so far. Look (safely) at the Sun's surface in the highest ...
The Sun's rotation was thus shown to vary by latitude and that its outer layer must be fluid. In 1871 Hermann Vogel, and shortly thereafter by Charles Young confirmed this spectroscopically. Nils Dúner's spectroscopic observation in the 1880s showed a 30% difference between the Sun's faster equatorial regions and its slower polar regions. [29]
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.
The Sun is said to be extremely noisy, but we can’t hear it since sound doesn’t travel through space. Scientists at the University of Sheffield decided to use vibrations within our star's ...