To the moon and back in ninety days : a thrilling narrative of blended science and adventure (1922)
Brown, John Young, 1858-1921, Lunar Publishing Company. pbl · Providence, Kentucky : Lunar Publishing Company · leaf 108
You understand that B has two pulls on C—onewhile C is at a distance of two astronomical units, andanother while at a distance of one astronomical unit.From these data is derived the inverse proportion. Latter Pull of B on C : Former Pull of B on C :: 2 : 1\or :: 4 : 1=4. In other words, the…
Astronomy
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