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sr is the unit, steradian, sr = rad 2. Because the surface area A of a sphere is 4πr 2, the definition implies that a sphere subtends 4π steradians (≈ 12.56637 sr) at its centre, or that a steradian subtends 1/4π ≈ 0.07958 of a sphere. By the same argument, the maximum solid angle that can be subtended at any point is 4π sr.
Solid angles can also be measured in square degrees (1 sr = (180/ π) 2 square degrees), in square arc-minutes and square arc-seconds, or in fractions of the sphere (1 sr = 1 / 4 π fractional area), also known as spat (1 sp = 4 π sr). In spherical coordinates there is a formula for the differential,
IBM System/4 Pi, a family of avionics computers; 4Pi microscope, a microscope that uses interference and fluorescence computers; 4×π = 12.56637..., the solid angle of a complete sphere measured in steradians; Hermetic detector (also called a 4π detector)
China based cryptocurrency, formerly ANT Shares and ANT Coins. The names were changed in 2017 to NEO and GAS. 2014 MazaCoin: MZC BTC Oyate Initiative SHA-256d: C++ [39] PoW: The underlying software is derived from that of another cryptocurrency, ZetaCoin. 2014 Monero: XMR Monero Core Team RandomX C++ [40] PoW
One version of the coin sold at auction for $3,960 in November 2020, according to the Professional Coin Grading Service (PCGS) website. 1972 Lincoln Penny Double Die Obverse
Most of the coins were made in red Böttger stoneware, but also in white porcelain. Some of them are partly gilt. Some of them are partly gilt. They were issued for the province Saxony in the cities Meissen and Freiberg , the state of Thuringia in the city of Eisenach , in Silesia in the city of Münsterberg and in Saxony-Anhalt in the city of ...
The 2025 Oscars — with Conan O'Brien as host — air Sunday, March 2 at 7 p.m. ET/4 p.m. PT on ABC and Hulu, with the official red carpet presentation beginning at 6:30 p.m. ET/3:30 p.m. PT.
The full moon covers only about 0.2 deg 2 of the sky when viewed from the surface of the Earth. The Moon is only a half degree across (i.e. a circular diameter of roughly 0.5°), so the moon's disk covers a circular area of: π ( 0.5° / 2 ) 2, or 0.2 square degrees.