The solar constant refers to that fact that the Sun's luminosity has remained unchanged in the age of the solar system.

Name: The solar constant refers to that fact that the Sun's luminosity has remained unchanged in the age of the solar system.
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The solar constant refers to the average amount of solar radiation received at the top of the Earth's atmosphere on a surface perpendicular to the Sun's rays, which is approximately 1361 watts per square meter, not to the unchanging luminosity of the Sun.

The Solar Constant Refers to That Fact That the Sun's