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Subjects>Science>Natural Sciences

What is an apostilb?

Updated: 12/14/2022

Bobo192 ∙

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∙ 8y ago

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An apostilb is a specific unit of luminance, the luminance of a perfectly diffusing emitting light at the rate of pi^-1 candela per square metre.

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What is luminosity and how is it measured in the case of the Sun?

Luminosity is the energy of all types is radiated by an object in all directions per sec. So it measured in ergs per sec or Joule per sec (= Watt). Luminosity can be measured in more than one unit. - Candela per square metre - Stilb - Apostilb - Lambert - Foot-lambert Each one is explained in the related links below. Previous answer Candela per square meter or for illuminance.

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