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second |
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secondBasic SI unit of time, one-sixtieth of a minute. It is defined as the duration of 9,192,631,770 cycles of regulation (periods of the radiation corresponding to the transition between two hyperfine levels of the ground state) of the caesium-133 isotope. In mathematics, the second is a unit (symbol ") of angular measurement, equalling one-sixtieth of a minute, which in turn is one-sixtieth of a degree. second
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Arc Second and its technologies will be a key engine fueling the growth of the Metris group in the future," said Bart Van Coppenolle, President and CEO of Metris. Barrientos also added, "With X-Station, Arc Second has created a new class of portable instruments that spans the breadth of measurement applications from construction to high-precision metrology applications. Astronomy and astrophysics: Among the telescopes envisioned for the sky-watchers of tomorrow is a group of orbiting radiotelescopes, linked by laser beams into interferometers with baselines up to 100 times the diameter of the earth and capable of resolving sources as narrow as 10 one-millionths of an arc second. |
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