Vulcan

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Vulcan

Vulcan in astronomy, hypothetical planet whose existence was proposed by Leverrier to explain part of the advance of the perihelion of Mercury , not all of which could be accounted for by gravitational effects of the other planets under the Newtonian theory of gravitation . The general theory of relativity explains the observed advance of the perihelion of Mercury as being caused by the curvature of space in the vicinity of the sun as a result of the sun's large mass.

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Vulcan

The Oxford Essential Dictionary of the U.S. Military | 2001 | Â© The Oxford Essential Dictionary of the U.S. Military 2001, originally published by Oxford University Press 2001. (Hide copyright information) Copyright

Vulcan an antiaircraft artillery gun with a 6-barreled, air-cooled, 20 mm rotary-fired system, designed for mounting on an armored personnel carrier. It was developed in the 1960s.

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