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a) the greatest distance at which a black object of suitable dimensions, situated near the ground, can be seen and recognized when observed against a bright background; b) the greatest distance at which lights in the vicinity of 1,000 candelas can be ...
candle"The original unit of luminous intensity, defined as the luminous intensity of a candle of particular construction. The candle was eventually replaced by the international candle, the new candle in 1939, and finally the candela in 1948.
 See also: Air, Temperature, Front, Surface, Normal
  
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