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

Have you heard of an apparent horizon?

Yes, but I'm measuring the visual horizon

That's the better one to use

Theodolites are only good up to about 400 yards

I can give you manufacturers specifications

You didnt do your research

wait do you know what a theodolite is?

it measures angles, not distance

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

The angles can only be measured accurately up to 400 yards or so

No you're wrong

yards isn't angle

Lol

i'm not using it in distance mode

No you're 100% wrong sorry

Its not accurate past 400 yards

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

And it can tell you horizontal accurately

Show me specs saying a theodolite measures a horizon 6 miles away

Then ill believe you

Gtg

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

K where does it say accuracy

For distance

It's not used for distance

it's used for measuring angles

like a sextant

You cant measure an angle that far away

Youre wrong

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