No need to measure it over any massive distance.
Observation over distance that show landmarks over water, is more than enough.
However, the basics are right there in the faces of anyone who wishes to test.
Merely throwing it aside because you were told Earth is a spinning globe, means you go with the narrative that has zero reality of tests but does have plenty of pretence.
Yep, for mathematically true observations.
Ok, like I asked you before.
Tell me how you can get the distance to the moon and it's size.
Do not appeal to authority on this.
Let's see where you go on it.
If maths works and trig is all good and proper for things in the sky, then take me through it as simple and easy to prove. Can you offer that?
If you can then we can move on a little to see how it comes to what you suggest.
And you're welcome to that.
Show me.
Valid as in what?
You mean it's valid as a shape or valid as a planet?
The thing about a planetarium as they call it) it just is. The thing about a dome and projections is....it just is. It's easy to say it but proving what's being said is the hardest part.
I'm waiting for question 1 and then we can move to question 2...and so on.
Are you ready?