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Definitions:
Noun
candle
candela
cd
standard candle
Definition: the basic unit of luminous intensity adopted under the Systeme International d'Unites; equal to 1/60 of the luminous intensity per square centimeter of a black body radiating at the temperature of 2,046 degrees Kelvin
Definition: Any astronomical object of known absolute magnitude. Its distance can then be calculated from its apparent magnitude.