@Citizen Z Is this the right place?

So i think that the horizon dropping below eye level with altitude is proof the earth can't be flat

Ok i can tell you my measurements, show you images, would that suffice?

Didd that include a theodolite, and an accurate indication of horizontal eye level?

Yes, but I'm measuring the visual horizon

That's the better one to use

wait do you know what a theodolite is?

it measures angles, not distance

sorry I'm a CE surveyor, you're wrong

yards isn't angle

i'm not using it in distance mode

No you're 100% wrong sorry

It reports the visual angle between any two things in your view

And it can tell you horizontal accurately

This explains it well : http://www.johnsonlevel.com/News/TheodolitesAllAboutTheodo

It isnt' measuring the distance

Can you SEE the horizon through the sight of the theodolite?

then you can measure teh angle

And that's all you need

It's not used for distance

it's used for measuring angles

like a sextant

A theodolite /θiːˈɒdəlaɪt/ is a precision optical instrument for measuring angles between designated visible points in the horizontal and vertical planes.

No you're wrong, if it' sin your view you can measure the visual angle

Dunno why you're saying this

Just like i can measure angular size of the moon or sun

or an object out in the ocean

1 microrad is a typical resolution for the angle

https://www.youtube.com/watch?v=NqOQ_BCtqUI