/sci/ - Science & Math

>>11179690
>>11179698
In that sun and horizon observation, did they account for lights behavior in air in several conditions? The suns rays bend and sometimes the sun is magnified by the air surrounding us. https://wiki.tfes.org/Equinox

Further the horizon is an apparent visual line, keyword meaning apparent.
If what we truly see as curvature and the measurements are sound then we can test it by aircraft.
If the Earth were truly a sphere 25,000 miles in circumference, airplane pilots would have to constantly correct their altitudes downwards so as to not fly straight off into “outer space;” a pilot wishing to simply maintain their altitude at a typical cruising speed of 500 mph, would have to constantly dip their nose downwards and descend 2,777 feet (over half a mile) every minute. Otherwise, without compensation, in one hour’s time the pilot would find themselves 31.5 miles higher than expected.
We dont observe this. A concorde plane would have to adjust for curvature. And assuming everything as flat to make calculations work in practice and not theory proves there is no curvature.

"COMPARED to errors from other sources,
the errors introduced into most conven- tional photogrammetric techniques by earth's curvature and atmospheric refrac- tion are of such small magnitude as to be negligible." ------The Effects of Earth's Curvature and Refraction on the Mensuration of Vertical Photographs*
J. W . S M I T H ,
N. Y. College of Forestry, Syracuse University, Syracuse, N. Y.