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Cake day: June 22nd, 2023

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  • I think it has to do with atmospheric diffusion of the sunlight. Even if the photons coming straight down at you are blocked by the moon, a lot of them bounce around in the atmosphere and end up reaching your eyes. Kinda like when it’s not complete darkness at sunset even after the sun has gone over the horizon. Also explains why the sky is blue, since “blue photons” are better at bouncing around on the atmosphere molecules. See : diffuse sky radiation

    Quoting form the Wikipedia article: Approximately 23% of direct incident radiation of total sunlight is removed from the direct solar beam by scattering into the atmosphere; of this amount (of incident radiation) about two-thirds ultimately reaches the earth as photon diffused skylight radiation.

    Edit : probably mostly has to do with your eyes adapting to the luminosity and non linearity of light intensity perception by our eyes. See posts below about Weber-Fechner law of perception.

    Edit Edit : This is an intersting read. The TLDR is it mostly has to do with our eyes slowly adapting to the amount of light they receive, and during totality, light bouncing from beyond the umbra comes into play.