Cloud, Steel, Night

Pale Blue, Slate, Night

Sky deepening through the hours

Pale Blue, Cobalt, Night

The sky in full and in darkness

Pale Sky, Cobalt, Navy

Blue from pale to deep

Pale Blue, Violet, Night

Sky into twilight into dark

Pale Blue, Violet, Dark

Cool spectrum from open to deep

Violet Dusk

The sky fifteen minutes after sunset