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sci.solar-constant-irradiance Calculator
Calculates solar irradiance at Earth's surface from the solar constant (1,361 W/m²), solar zenith angle, and atmospheric transmittance. Peak surface irradiance at sea level ≈ 1,000 W/m² on a clear day at solar noon — global horizontal irradiance integrates this over the day to give daily insolation.
Inputs
Distance Au
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Solar Luminosity Lsun
Reference formula or conversion factor shown for context.
Results
irradiance (W/m²)
IRR (internal rate of return) -- the annualised return rate at which net present value equals zero. If IRR exceeds the hurdle rate, the investment adds value.
vs Earth solar constant
Sample size or count used in the calculation.
S = L / (4πd²)
Reference formula or conversion factor shown for context.