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Apart from the presence of ice-containing clouds in the right position in the sky, the halo requires that the light source (Sun or Moon) be very high in the sky, at an elevation of 58° or greater. This means that the solar variety of the halo is impossible to see at locations north of 55°N or south of 55°S.
The northern lights are expected to be strongest between Friday, Jan. 31, and Saturday, Feb. 1. The best time to view them is from 10:00 p.m. and 2 a.m. local time.
Sky-gazers can look forward to catching glimpses of four bright planets at the same time in the night sky. Venus and Saturn will appear in the southwest, Jupiter will gleam overhead, and Mars will ...
A circumzenithal arc in Salem, Massachusetts, Oct 27, 2012. Also visible are a supralateral arc, Parry arc (upper suncave), and upper tangent arc. From top to bottom: a circumzenithal arc on top of a 46° halo, on top of a Parry arc, on top of a tangent arc, on top of a 22° halo, on top of the actual sun.
Using a single crystal, one needs to realize all possible 3D orientations of the crystal. This has recently been achieved by two approaches. The first one using pneumatics and a sophisticated rigging, [29] and a second one using an Arduino-based random walk machine which stochastically reorients a crystal embedded in a transparent thin-walled ...
An unusual horned comet notable for a series of recent outbursts will be visible in the night sky for the remainder of March — and astronomers expect the so-called devil comet to make a rare ...
The constellation Sagittarius. North is to the left. The line going to the right connects ζ to α and β Sagittarii. Above this line one sees Corona Australis. α Sgr (Rukbat, meaning "the archer's knee" [6]) despite having the "alpha" designation, is not the brightest star of the constellation, having a magnitude of only 3.96. It is towards ...
Visualization of a celestial sphere. In astronomy and navigation, the celestial sphere is an abstract sphere that has an arbitrarily large radius and is concentric to Earth.All objects in the sky can be conceived as being projected upon the inner surface of the celestial sphere, which may be centered on Earth or the observer.