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Low Solar Angle Exposure

Meaning

Low Solar Angle Exposure refers to the specific periods of the day, primarily occurring shortly after sunrise and just before sunset, when the sun is positioned low on the horizon, causing its light to traverse a significantly greater portion of the Earth’s atmosphere. This extensive atmospheric filtering markedly reduces the intensity of the blue light wavelengths while simultaneously allowing the longer, less energetic red and infrared wavelengths to dominate the spectrum reaching the retina. This particular, filtered light profile is recognized as a critical, evolutionarily conserved zeitgeber for human circadian biology.