shadowLightPosition

uniform vec3 shadowLightPosition;

This value stores the position of the highest celestial body in view space. This means during the day shadowLightPosition will track the sun and during the night it will track the moon. This matches direction used for the shadow pass. The length of this value is always 100, as it represents a position not a direction. This value can be converted to screen space directly to get the screen space position of the celestial body.