It seems that the more people want to disprove the flat earth hypotheses, the more validity they give it. It seems incredible to me, that with our knowledge of mathematics and science, this isn't a more straight forward and clear process. Why has it become so complicated I wonder.
If you would like to code your own calculator you will find the source here: https://github.com/dizzib/earthcalc
If you would like to understand better the complexity of Earth curvature mathematics, then you might be interested in this dissertation:
https://chizzlewit.wordpress.com/2015/05/13/working-with-the-curvaure-of-a-spherical-earth/
Thank you for watching.