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Machrie Stone Circle 2. Machrie Moor 2 (grid reference) is the most visually striking of the circles on Machrie Moor. [1] This circle has a diameter of 13.7 metres, and may originally have consisted of seven or eight tall sandstone slabs, three of which survive intact, while stumps of others may be seen. [9]
Mesklin is a fictional planet created by Hal Clement and used in a number of his hard science fiction stories, starting with Mission of Gravity (1954). Alongside the novel's original 1953 serialization in Astounding Science Fiction, Clement published an essay titled "Whirligig World" detailing the process of designing the planet to have the properties he wanted.
The NAC found a glow of 0.03 DN, and the lunar horizon was found to have a glow of 0.2 DN. A spectral radiance of 0.01 W/m 2 /sr/um was predicted to be detected by the NAC. So for the given observing geometry, the lunar horizon glow must be dimmer than 0.01 W/m 2 /sr/um. [10]
This geometry also defines lunes of greater angles: {2} π-θ, and {2} 2π-θ. In spherical geometry, a spherical lune (or biangle) is an area on a sphere bounded by two half great circles which meet at antipodal points. [1] It is an example of a digon, {2} θ, with dihedral angle θ. [2] The word "lune" derives from luna, the Latin word for Moon.
Generally of 1 to 3 feet or more in diameter, it was divided to 2 or 5 arcminutes, on a slip of silver set into the face of the circle near the circumference. These graduations were read by microscopes, generally four for each circle, mounted to the piers or a framework surrounding the axis, at 90° intervals around the circles. By averaging ...
[5] Frequency. How often a circumhorizontal arc is seen depends on the location and the latitude of the observer. In the United States it is a relatively common halo ...
This is a tilted crustal block, about 200 km across, that rises to a maximum elevation of 2 km above the mare in the southeastern section. [2] Aristarchus is just to the east of the crater Herodotus and the Vallis Schröteri , and south of a system of narrow sinuous rilles named Rimae Aristarchus .
In plane geometry, a lune (from Latin luna 'moon') is the concave-convex region bounded by two circular arcs. [1] It has one boundary portion for which the connecting segment of any two nearby points moves outside the region and another boundary portion for which the connecting segment of any two nearby points lies entirely inside the region.