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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⊙.

When an orbiting planet crosses the Earth-facing side of its parent star, a bit of the light from the star is temporarily blocked, reducing overall luminosity by a tiny but detectable amount.

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

Aug 28, 2025 · Luminosity is the total energy emitted by a celestial object per unit of time from its surface. It radiates across the entire electromagnetic spectrum. Unlike apparent brightness, …

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 the total …

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 appears from a …

luminosity noun Exceptional brightness and clarity, as of a cut and polished stone:

Luminosity is the quality of something that gives off light or shines with reflected light. The most noticeable quality of a large, sparkly diamond is its luminosity.