The Discovery That the Planetary Orbits Are Ellipses Rather Than

question 22

Multiple Choice

The discovery that the planetary orbits are ellipses rather than circles was made by

• A) Ptolemy.
• B) Copernicus.
• C) Kepler.
• D) Newton.

---

Definitions:

Spindle Move

The action or ability of a spindle (a rotating axis of the machine, which often holds the workpiece) to move or be positioned within a machine.

Knife Blade

A thin, sharp-edged instrument typically used for cutting or as a tool, made of metal or other hard materials.

Punch

An impact tool used to drive out pins, rivets, or shafts, or to scribe/mark components for identification.

Return Stroke

The motion of a piston or lever returning to its original position after completing a pressing or striking action.