Longest line of sight.

Discussion created by donatasg on Apr 19, 2018
Latest reply on Apr 23, 2018 by xander_bakker

As far I'm not familiar with GIS, my question can sound strange :)

Is it possible to calculate longest (theoretical) line of sight (in Earth)?

I found many tools which can calculate line of sight, but you must know at least point A, which in my case is unknown.