orthodromic distance:
the shortest distance between two points P, Q on the surface of the sphere of radius R
if we know  longitude (east-west position),  latitude (north-south position)  of P and Q

Write the values in the boxes.  Then press    -  Clear all:

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lon P = °    lat P = °

lon Q = °    lat Q = °

R =

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DIST. = 

[se ottieni  NaN  l'espressione sta per "not a number"]

storage area:

If you have to put a coefficient using some function symbol (1/5,π,√2,...), put it in a numerical form (calcolatrice) esempi