I highly recommend perusing the wiki here! Just keep in mind it is a wiki, and not a bible.https://wiki.tfes.org/Sunrise_and_SunsetIn my view the distance the light from the sun can travel (all light in general) is finite. The two main reasons for this are light’s natural attenuation (because it is a pressure wave) and the typical density gradient in our air which causes light to curve convexly towards the ground.
the typical density gradient in our air which causes light to curve convexly towards the ground.
If we are not speculating then we must assume