Flux Calculator · The Terran Sphere

Your Latitude

Latitude

34.0°N · △ Northern Hemisphere

Solar Flux at Solar Noon Today · Top of Atmosphere

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0 400 800 1200 1361 W/m²

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TOA Peak Flux —

Top of atmosphere at solar noon. No atmospheric loss.

Surface Estimate —

Clear sky estimate after atmospheric absorption (~70% transmission at zenith).

Daily Total —

Integrated flux over all daylight hours today. kWh/m²/day.

Solar Altitude —

Sun's maximum height above horizon at solar noon today.

Solar Declination —

Angle of sun above/below celestial equator. ±23.436° at solstices.

Earth-Sun Distance —

Today's distance factor relative to mean. Perihelion Jan 3, aphelion Jul 4.

Flux by Latitude · Today · TOA Peak W/m²

Your Flux Across the Terran Year · Daily Total kWh/m²

UV Index & Vitamin D · Solar Noon Today

UV Index

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LowModHigh V.HighExtreme

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Skin Safety

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Vitamin D Synthesis Time · Face + Arms Exposed

Fair Skin (I–II) —

Medium Skin (III–IV) —

Dark Skin (V–VI) —

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The 6.9% Southern Hemisphere Advantage

NH Summer Peak (Aphelion · Jul 4) 1,316 W/m²

SH Summer Peak (Perihelion · Jan 3) 1,406 W/m²

Difference +90 W/m²

Asymmetry +6.9% SH advantage

Earth's orbital eccentricity (0.0167) means it is closest to the sun in early January — during Southern Hemisphere summer — and furthest in early July, during Northern Hemisphere summer. By the inverse square law, the SH receives 6.9% more solar energy at its summer peak than the NH does at its own. The Gregorian calendar contains no acknowledgment of this physically measurable asymmetry. The Terran Series does.