☀️ Circadian Sun Simulator

Clear-sky daylight spectrum for any place, date and time

Local time

12:00

Speed1.0x

🌅 Sunrise –☀️ Solar noon –🌇 Sunset –

Location & date

Berlin, Germany

Irradiance 280–1000 nm

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Illuminance

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lux (photopic)

Colour temperature

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Melanopic EDI

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Spectrum 280–1000 nm · W/m²/nm

Current day · illuminance · melanopic EDI (log scale)

Spectral bands · W/m² · % of total

12-month comparison

12:00

Clear-sky estimate (cloudless, rural aerosol: AOD₅₀₀ 0.10, water vapour 1.42 cm, ozone 0.31 atm-cm). Sun position: NOAA algorithm. Spectrum: Bird & Riordan SPECTRL2 (horizontal surface). Twilight below 1° elevation is an empirical sky-light model. Photometry: CIE 1931 2° / V(λ); melanopic per CIE S 026. Real light varies a lot with clouds, haze, shade and surroundings. Not medical advice.