Question

What is the solar constant? What is its value?

Answer 1

1. The solar constant is defined as the total radiation energy received from the Sun per unit of time per unit of area on a notional surface perpendicular to the Sun's beams and at Earth's mean distance from the Sun.
2. It is most precisely measured from satellites when atmospheric effects are not present.
3. The constant's value is approximately 1.366 kilowatts per square meter.