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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from From the Earth to the Moon by Jules Verne: ought to be the initiatory speed of the projectile, and that by
a simple formula."
"Let us see."
"You shall see it; only I shall not give you the real course
drawn by the projectile between the moon and the earth in
considering their motion round the sun. No, I shall consider
these two orbs as perfectly motionless, which will answer all
our purpose."
"And why?"
"Because it will be trying to solve the problem called `the
problem of the three bodies,' for which the integral calculus is
From the Earth to the Moon | 
