Overall star brightness.
Sky luminance (renderer units) of a truly dark sky; brighter skies lower the limiting magnitude.
Multiplier on how many stars each cell layer holds, 0..1.5.
Draw stars (and the Milky Way).
Faintest magnitude shown under a perfectly dark sky (6 ≈ naked eye, 8 = binoculars-rich).
Milky Way settings.
Colour saturation of star tints, 0 (white) .. 2.
Seed for star positions, brightness and colours.
Star size in pixels (they're points, so keep it ~1).
Twinkle strength, 0..1. Grows towards the horizon.
Twinkle speed multiplier.
Star field settings. Plain JSON.