Yeah I'm aware that there is always a tilt. Some things we see in the sky don't make any sense though on a convex Earth,
Everything we see in the sky makes sense on a convex earth. Most things we see in the sky make sense
only on a convex spheroidal earth.
like the Moon for example. How is it that at noon time the Moon appears like this when the Sun is overhead and the Moon is around 20 degrees high in the sky it would make sense that we would see like the lower 60% in shadow, not the left 47%.
If the sun is nearly overhead while the moon is 20 degrees above the horizon, then the moon will be a crescent, which means it's less than half illuminated, and the lower part
is in shadow. Why do you think the left part would be? The photos on the bottom aren't of a moon of that age. Nor is it 20 degrees above the horizon unless the photo is rotated so that the top of the picture isn't up (unless taken from a very high northern latitude, in which case the sun can't be anywhere near overhead).
Now if the Earth was concave it would make more sense as the Moon is following behind the Sun so the Sun would be more west then the east moon so it's rays would hit the Moon mostly from the east side or right side and because the heavens are only 3960 earth mass miles deep and the Sun, Moon and Earth are all the same size but you can only see 1/12th and of that you only see 59 of 60 parts but yet even though apparent size is much smaller the actual physical reality of seeing 98.563% of half one side remains.
This makes no sense whatsoever.
TLDR: Moon in 70 degrees East Sky (20 degrees above horizon) shows west shadow when Sun is directly overhead about 70 degrees westward of Moon (directly between east and west). If Sun was really 93 Million miles away then Moon shadow should be overhead as well and because we would be under the moon we should see more of the shadow. In my scenario above this is predicted outcome vs reality.
In your scenario, we're not "under" the moon. Remember, it's 20 degrees above the horizon, which means 70 degrees east of the zenith; we're "under" it when it's near the zenith, right?? If I misunderstand, what do you mean by "under"?

Reality shows a moon more than 70 degrees from the sun! In fact, this picture shows a moon more than 90 degrees from the sun. You can tell just from the picture because more than 50% is lit.