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
More metrics
Year heatmap
hours × days · click to jump
12-month comparison
12:00
Clear-sky estimate (cloudless, rural aerosol: AOD₅₀₀ 0.10, water vapour 1.42 cm, ozone 300 DU). 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); α-opic per CIE S 026; UV index via CIE erythemal spectrum (±~20%); CLA 2.0/CS per Rea et al. 2021 (LRC). Real light varies a lot with clouds, haze, shade and surroundings. Not medical advice.