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In SI units, luminosity is measured in joules per second, or watts. In astronomy, values for luminosity are often given in the terms of the luminosity of the Sun, L⊙.

luminosity noun lu· mi· nos· i· ty ˌlü-mə-ˈnä-sə-tē plural luminosities Synonyms of luminosity 1 a : the quality or state of being luminous

Luminosity, in astronomy, the amount of light emitted by an object in a unit of time. The luminosity of the Sun is 3.846 × 1026 watts (or 3.846 × 1033 ergs per second). Luminosity is an absolute …

LUMINOSITY definition: 1. the state of producing or reflecting bright light; the state of appearing to shine: 2. the…. Learn more.

Astronomy., the brightness of a star in comparison with that of the sun: the luminosity of Sirius expressed as 23 indicates an intrinsic brightness 23 times as great as that of the sun.

the brightness of a star in comparison with that of the sun: the luminosity of Sirius expressed as 23 indicates an intrinsic brightness 23 times as great as that of the sun

Nov 5, 2025 · Luminosity and brightness are related concepts, but they are not the same thing. Brightness refers to how an object appears to an observer, while luminosity is a measure of …

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Luminosity is an intrinsic, fixed measure of the total energy an object radiates per second. In contrast, apparent brightness is an observer-dependent measure of how bright an object …