Using the orientation of the Earth, those two position measurements, and the distance between the two locations on the Earth, the distance to the Moon can be triangulated: d i s t a n c e m o o n = d i s t a n c e o b s e r v e r b a s e tan ⁡ ( a n g l e ) {\displaystyle \mathrm {distance} _{\mathrm {moon} }={\frac {\mathrm {distance} _{\mathrm {observerbase} }}{\tan(\mathrm {angle} )}}} This is the method referred to by Jules Verne in From the Earth to the Moon: Until then, many people had no idea how one could calculate the distance separating the Moon from the Earth.
使用地球的方位，測量這兩個點的方位，和這兩個點在地球上的距離，可以用三角學測量月球的距離： d i s t a n c e moon = d i s t a n c e o b s e r v e r b a s e tan ⁡ ( a n g l e ) {\displaystyle \mathrm {distance} _{\textrm {moon}}={\frac {\mathrm {distance} _{\mathrm {observerbase} }}{\tan(\mathrm {angle} )}}} 這是儒勒·凡爾納在從地球到月球這本書中所提到的方法： 直到此刻，許多人仍然不知道如何計算地球與月球相隔的距離。