In article , Max Demian
wrote:
On 19/03/2018 10:26, Brian Gaff wrote:
Well the earth is curved after all, so in reality nothing is flat or
level is it?

I wonder how big a thing (building? bridge?) has to be before designers
have to take into account the curvature of the earth?

It's certainly taken into account when predicting uhf tv coverage.

--
from KT24 in Surrey, England