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

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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 …

What is Luminosity? Luminosity refers to the total amount of energy produced by different celestial bodies (stars, galaxy) per unit time and it is basically measured in joules per second or watts in …

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.

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