The solar constant (denoted as S☉ by the IAU standard) is a mathematical equation averaging the amount of energy received by a given area one astronomical unit away from the Sun. To put simply, it is measuring the amount of energy per second per square meter that arrives from the Sun at the distance of Earth's orbit.
The solar constant (denoted as S☉ by the IAU standard) is a mathematical equation averaging the amount of energy received by a given area one astronomical unit away from the Sun. To put simply, it is measuring the amount of energy per second per square meter that arrives from the Sun at the distance of Earth's orbit.
Source: Wikipedia "Solar constant" · CC BY-SA 4.0
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