This page is such a well executed interactive map. Really enjoyed it

Is the math-planation of your random fact basically

(thanks to https://news.ycombinator.com/user?id=Hikikomori for correcting the lightspeed in fibre medium from 3e5 to 2e5 !)

- lightspeed is 2e5 km/s ~ 2e2 km/ms, so/

- length (km) / 200 (km)/ms ~ K length (km) / 200 (km)/ms, so

- latency (ms) ~ K' length (km)

Where K is approximately 1.3 (K' is 1/155) and factors in things like:

- non straight line distance

- networking overhead / switching

- both ways / measurement error

Basically?