The sky interpolates between roughly five colors vertically across the screen. Always brighter at the horizon, implying that a "sliding window" for colors in the palette is backwards in the AM and forwards in the PM.

Clear sky (DAYTIME.COL)

• 6:00am: very dark blue
• 6:15am: blue at horizon, very dark blue in sky
• 6:45am: mild blue all around, slightly brighter at horizon
• 7:30am: light blue
• 11:00am: bright teal
• 12:00pm: brightest teal
• 4:15pm: horizon is bright teal, sky just starting to be bluish-yellow
• 4:30pm: horizon is bluish-yellow, sky is yellow-ish
• 5:00pm: orange
• 5:15pm: red
• 5:30pm: dim red
• 6:00pm: very dark blue (stays this way all night)

To do: verify whether DREARY.COL is used for overcast/rain/snow.

Ambient light

• Starts increasing at 6:00am
• Completely bright at 6:15am
• Starts decreasing at 5:45pm
• Completely dark at 6:00pm

Distant land

• Roughly half or quarter intensity at night
• Intensity fades at the same time as ambient light
• Drawing order (near to far): mountains, clouds, sun, stars

Distant sky

• Sun is at horizon at 6:00am and 6:00pm
• Stars move as if the earth is rotating on an axis
• Possibly uses quaternion