How does the sun's height over a morning change where in the sky the deepest blue appears, and does the peak shift as the sun climbs?

The records show that Rayleigh scattering by atmospheric gases is responsible for the blue colour of the sky under clear conditions ¹. A separate 2021 item on relative sky radiance from all-sky camera images is listed, but the verified facts do not describe its findings ¹. Nothing in the verified facts says where the deepest blue appears as the sun's height changes over a morning, or whether that peak shifts as the sun climbs ¹. The newest fact is dated 2021, about five years before October 2026 ¹.

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