alok c, on 2017-March-24, 01:32, said:
Measure the distance between two fixed posts sufficiently apart thru air (theodolite,laser) & along ground (chainage) & see the difference.
This is also very close to one of the techniques that works for posts that are large enough (eg long bridges) providing you cal also demonstrate that the "posts" are absolutely vertical in relation to the ground. In fact long suspension bridges need to take account of the difference in lengths between the top and bottoms of their supporting towers to function correctly. But I personally do not have equipment sensitive enough so this is another technique, like satellites, that relies on taking someone else's word for it.
Some other possible proofs include shooting weapons over long distances West and East and observing the difference, or, simple if impractical, visiting the South Pole. But the simplest method is probably the
Foucault_pendulum (my reference in the previous post on plumb lines). So yes, there is enough proof out there but it is still imho more difficult than disproving a typical alternative fact, which are usually obviously false from the briefest of investigations.