"Seriously?"
"Quite seriously."
"And can you use that tool in my presence?"
"If it will interest you."
"And show me how they calculated the initiatory speed of our car?"
"Yes, my worthy friend; taking into consideration all the elements of the problem, the distance from the centre of the earth to the centre of the moon, of the radius of the earth, of its bulk, and of the bulk of the moon, I can tell exactly what 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 not yet far enough advanced."