Depends on what you mean by sunrise/sunset. “The relative position of the sun’s edge drops below/rises above the tangent of the average surface at sea level” is pretty easy to calculate many years out; the complications are deviations in Earth’s orbit. “I can/can’t see the sun anymore” depends on local weather, good luck.

> “I can/can’t see the sun anymore” depends on local weather

For anyone wanting to know a bit more about why this is, here's some additional details:

https://www.youtube.com/watch?v=-sj868IzNrk

https://en.wikipedia.org/wiki/Atmospheric_refraction

Technically, one might also argue something weird like, "If I can see sunlight, it's still daytime" in which case a different phenomina would come into play:

https://www.atoptics.co.uk/highsky/zod1.htm

https://en.wikipedia.org/wiki/Zodiacal_light

What this all comes down to is, roughly speaking, even after the sun has technically set, there's still a bit of leeway before we no longer see the sun/sunlight due additional factors.

Infinite, there is a mathematical formula: https://en.wikipedia.org/wiki/Sunrise_equation

I am frustrated in the faintness of memory, but I dimly recollect an area which, for about two years, altered time every day so that noon was when the sun was directly over head. Something Royal Time, or something Solar Time.

There are some weird time zones out there.