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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, 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 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

Mar 15, 2026 · 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 the total …

The luminosity of a star, on the other hand, is the amount of light it emits from its surface. The difference between luminosity and apparent brightness depends on distance.

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