Ex Mensura, Scientia
High-precision range calculator. Companion to Wndsn Telemeters: Low tech, high utility graphical distance & altitude computers from the Wndsn applied science lab.
By way of using a Wndsn Quadrant or Telemeter measuring degrees or a hairline graticule measuring mil or moa or any other instrument or technique that returns the angular size of a known object, we can determine the distance to that object.

The angular relationship between height and distance.
[Load sample values (JSON) (XML) (CSV).]
Compare MIL vs. MRAD vs. NATO-MIL.
1 rad = 57.3 deg
6.2832 rad = 360 deg = 6,283.2 mil = 6,400 natomil = 21,600 minutes (moa)
0.017453 rad = 1 deg = 17.453 mil = 17.778 natomil = 60 minutes (moa)
0.0573 deg = 1 mil = 1.019 natomil = 3.438 minutes (moa)
0.05625 deg = 0.982 mil = 1 natomil = 3.375 minutes (moa)
Radian, degrees, mrad, NATO-MIL, and MOA.