What if the Sun isn’t really rising and it’s just the Earth that’s spinning?

It would mean that the sky is standing essentially still,

but you are watching it from a rolling platform.

Like this:

https://www.youtube.com/watch?v=1zJ9FnQXmJI

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Regards,

John Popelish

According to Einstein's theory

ALL motion is relative to the frame of reference of the observer.

That is to say:

from the point of view of anyone on Earth

the Sun actually and literally and in reality orbits about the Earth

(appearing to "rise" and "set" as it does so).

Similarly:

from the point of view of anyone on the Sun

(there aren't very many people there at the current time)

the Earth actually and literally and in reality both spins on an imaginary rotational axis and orbits about the Sun.

In classical (Newtonian / Keplerian) mechanics

the Earth no more orbits about the Sun than it orbits about Mercury and Venus.

Rather: the Earth orbits about the center of mass of the Solar System

as do all of the planets

***and so does the Sun***.

It's just that the Sun just is closer to that center of mass

than are any of the planets.

(That is: the Sun's orbit is even closer to the center of mass than is Mercury's orbit.)

- Bach Sci Physics 1989

Clearly you have never seen a sunset or sunrise in the morning, it is a matter of the persons visual perspective.