# calculator

1. ### Geogebra tool to compare distances on a Flat Earth with a Globe

This looks like a neat tool. I don't know who made it or how accurate it is, but it says the distance from Australia to New Zealand on a flat Earth would be 3526 miles, compared to 1309 miles on a globe. https://www.geogebra.org/m/CMZMru7g So I compared that to the length of the Tasman Global...
2. ### Calculator for viewing angles

Please find attached an excel spreadsheet containing a calculator which works out the viewing (elevation) angles for an observer of a given height on both a flat and sphere earth, from distances and elevations. This is what it looks like: For the flat earth, it's simple trig - tan(x)=(target...
3. ### How can we explain perspective calculations simply?

Perspective is difficult, both to understand and to explain. This was recently brought home to me listening to flat earthers Nathan Oakley and Anthony Riley attempt to explain this photo of mountains in Washington and Oregon: All decent analyses show that it aligns perfectly well with a globe...