Atmosphere halo strength (globe projection), 0..1; fades to 0 at night.
Ground-fog colour, CSS string (follows the direct sun colour so fog warms at golden hour).
Horizon-band colour, CSS string.
Blend between horizon and fog colours, 0..1 (harder below the horizon).
Upper sky-dome colour, CSS string.
Blend between sky and horizon colours, 0..1.
The subset of MapLibre's
setSkyspec that skyForAltitude drives. Loosely typed (plain CSS-colour strings + 0..1 blends) so this package needs nomaplibre-glimport; SkyController passes it straight tomap.setSky.