I'm not "misunderstanding" anything.
Because you do understand it, instead you are wilfully, intentionally, blatantly lying about it.
Sidereal and solar days are something you roundheads came up with to justify your woefully flawed model.
No, this is something which is a direct consequence of a combination of orbital and rotational motion.
This was not something that was just came up with rectify a flaw.
This is something that is directly measurable and observable, and a direct consequence of the model.
But because you do not give a damn about the truth at all, because you are happy to blatantly lie to everyone to prop up your dishonest, delusional BS, you keep coming back with this.
You criticize and insult and double-down, rather than dare admit that this is a fatal flaw
No, we don't.
Instead, we clearly and simply explain why you are wrong, as we have done countless times.
But because you cannot defend your lies, you just double down with more lies and insults, as you have done yet again.
Can you show any fault with the model?
No. All you can do is repeat the same refuted, pathetic lies.
If Earth was forced to tidal lock
It isn't.
So saying this is pointless.
If Earth on the other hand kept the same rotation all year long, you would have similar reversal, this time with days starting and ending at weird times according to the clock.
Why?
What magic is causing this?
This is a simple math problem, simple geometry.
If you have an object rotating about its axis, while orbiting a primary, then after a complete rotation about its axis, it will have moved along its orbit and need to turn more to face the primary again.
If Earth was in a perfectly circular orbit, with a perfect solar day of 24 hours, with a perfect year of 365 days, then it has to rotate 366 times. This gives a rotational period of ~86163.9 s.
So consider a starting point with some point on the planet pointing directly to the sun, with another point pointing directly to a distant star (one located a distance 100 thousand times the radius of the orbit).
After rotating exactly once, i.e. after 86163.934 seconds, that point pointing to a distant star will again be pointing to it (the change is negligible).
But the point initially pointing to the sun wont still be pointing to the sun. This is because it has moved along its orbit. Specifically it would have moved along by 0.9836... degrees. This means it needs to rotate more to line back up with the sun.
After 24 hours, it will have rotated 1.0027397 times.
This is equivalent to 360.9863 degrees. or 0.9863 degrees more than a single rotation.
The distant star no longer aligns.
But the sun does. This is because it has also moved along its orbit, specifically by 0.9863 degrees.
The solar day is LONGER than the sidereal day.
Now, what happens half way around its orbit?
Well it is a total time of exactly 4380 hours, or 182 solar days and 12 hours, or 183 sidereal days.
Again, there is no problem. There is none of the BS you are making up.
You just know that this shows no fault with the RE, HC model, so you continually lie about it.
If you think there is a problem, then explain it.
Don't just assert more pure BS, EXPLAIN the problem.
Or, be honest for once in your life and admit there is no fault and you have been lying.