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Globe at Night is an international scientific research program that crowdsources measurements of light pollution in the night sky. At set time periods within each year, the project asks people to count the number of stars that they can see from their location and report it to the project's website. The coordinating researchers compile this ...
SS United States is a retired ocean liner built between 1950 and 1951 for United States Lines. She is the largest ocean liner constructed entirely in the United States and the fastest ocean liner to cross the Atlantic in either direction, retaining the Blue Riband for the highest average speed since her maiden voyage in 1952, a title she still ...
World map. A world map is a map of most or all of the surface of Earth. World maps, because of their scale, must deal with the problem of projection. Maps rendered in two dimensions by necessity distort the display of the three-dimensional surface of the Earth. While this is true of any map, these distortions reach extremes in a world map.
A family of map projections that includes as special cases Mollweide projection, Collignon projection, and the various cylindrical equal-area projections. Depending on configuration, the projection also may map the sphere to a single diamond or a pair of squares. Hybrid of Collignon + Lambert cylindrical equal-area.
Whatever is after the comma is the night-time authorization, to avoid interfering with other, higher priority stations. Another comma indicates if it's a directional antenna system. DA means the station uses a directional antenna system. DA1 means the pattern is always directional, with the same pattern, day and night.
December 20, 1968. Trinity was the code name of the first detonation of a nuclear weapon, conducted by the United States Army at 5:29 a.m. MWT [ a ] (11:29:21 GMT) on July 16, 1945, as part of the Manhattan Project. The test was of an implosion-design plutonium bomb, nicknamed the "gadget", of the same design as the Fat Man bomb later detonated ...
A topographic map of the United States. The United States is the world's third-largest country by total area behind Russia and Canada. [d] [165] [166] The 48 contiguous states and the District of Columbia occupy a combined area of 3,119,885 square miles (8,080,470 km 2).
The Naval Battle of Guadalcanal, sometimes referred to as the Third and Fourth Battles of Savo Island, the Battle of the Solomons, The Battle of Friday the 13th, The Night of the Big Guns, or, in Japanese sources, the Third Battle of the Solomon Sea (第三次ソロモン海戦, Dai-san-ji Soromon Kaisen), took place from 12 to 15 November 1942 and was the decisive engagement in a series of ...