Chapter 03 of 5
The Sunset Shift
Why the blue disappears as the sun goes down.
- Geometric Reality
The Long Path
At noon, sunlight travels the shortest distance through the atmosphere. At sunset, light hits at a low angle, traveling through significantly more air.
- Optical Physics
The Filter Effect
As the path length increases, the atmosphere acts like a thickening filter. The longer the journey, the more light is scattered away.
- Rayleigh Redux
Blue Depletion
Because blue light scatters so easily, it is completely deflected out of your line of sight by the time light reaches you at dusk.
17 more cards in this chapter
Could you answer this?
Why does the sky appear red or orange during a sunset?
🌌 The Sky’s Blue Deception
- 01Debunking the Reflection MythWhy the ocean isn't painting the sky blue.
- 02The Rayleigh MechanismHow gas molecules scatter the short-wave blues.
- 03The Sunset ShiftWhy the blue disappears as the sun goes down.
- 04Mie Scattering & Volcanic HuesWhy clouds stay white and rare suns turn blue.
- 05The Violet ParadoxWhy we see blue when violet scatters more.