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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).

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 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 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

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 …

Luminosity is an absolute measure of radiated electromagnetic energy per unit time, and is synonymous with the radiant power emitted by a light-emitting object....