See related story: Exhibit Documents Newton's Pull

Principia
. Toward that end, he interleaved a copy of the first edition in order to note corrections and additions on blank sheets facing the original pages. Twenty-six years would pass before the second edition appeared.
In the 1680s, Isaac Newton argued that if a projectile were fired at a sufficient velocity, it would enter into an orbit around the earth.

The orrery, a mechanical model of the solar system, was a popular device to exhibit the relative size and motion of the heavenly bodies.
