siege-render/RadiometryValues.txt at master · SiegeEngine/siege-render · GitHub

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'natural' skyglow:

  https://www.nature.com/articles/srep01835?WT.ec_id=SREP-704-20130603
    'World Atlas' says
    0.000252 cd/m²

Milkyway luminosity:

  http://adsabs.harvard.edu/abs/2013AAS...22125411L
    absolute magnitude is Mr = -20.87 +0.33/-0.44 mag

  http://www.stjarnhimlen.se/comp/radfaq.html

    galactic pole: 30  (Luminance, S10vis)
    galactic equator 160 - 640  (Luminance, S10vis)
    1 S10vis = 0.69E-6 nit

  that makes it
    2.07e-05 at galactic pole
    0.0004416 at galactic equator (brightest part)

Star magnitudes:

  http://www.stjarnhimlen.se/comp/radfaq.html

    1 mv=0 star outside Earth's atmosphere = 2.54e-6 lux (cd·sr/m2)
    1 mv=0 star per sq degree outside Earth's atmosphere = 0.84e-2 nit (cd/m2)
    1 mv=0 star per sq degree inside clear unit airmass = 0.69e-2 nit (cd/m2)
    (clear unit airmass transmits 82% of visual light, dimming by 0.2 magnitudes)

  Magnitude 0 star is 2.45e+29 candela