Science & Nature - Crepuscular rays: why twilight sunbeams glow orange and red

Crepuscular rays are visible beams of sunlight that stream through gaps in cloud cover during dawn and dusk. Due to perspective, these parallel shafts of light seem to radiate outward across the sky, just as parallel roads appear to converge in the distance. At twilight, sunlight travels through about forty times more air than at midday. This long atmospheric path causes Rayleigh scattering to disperse shorter blue wavelengths, leaving crepuscular rays with a striking orange and reddish hue that makes them visually remarkable.

Source: Wikipedia