He made a continuous record of the positions of the Sun, Moon, and planets for almost 20 years.

He serve as an assistant to Brahe, who set him to work trying to find a satisfactory theory of planetary motion

The path of an object through space is called its ______

The orbit of that planet had the shape of a somewhat flattened circle, or _________

All planets move about the sun in elliptical orbits, having the sun as one of the foci. What Kepler’s planetary motion is it?

The widest diameter of the ellipse is called its ______.

Half this distance—that is, the distance from the center of the ellipse to one end—is the _______.

The ratio of the distance between the foci to the length of the major axis is called the ________.

Kepler’s second law deals with the speed with which each planet moves along its ellipse, also known as its ______.

Kepler discovered that the planet speeds up as it comes closer to the Sun and slows down as it pulls away from the Sun.

A planet’s orbital period, (P), as the time it takes a planet to travel once around the Sun. A planet’s semimajor axis, a, is equal to its average distance from the Sun. Is expressed to?

Wanted to know why the orbits of the planets were spaced as they are and to find a mathematical pattern in their movements—a “harmony of the spheres”. In what law this imply?

Which Kepler’s Law of Planetary Motion is this?

Which Kepler’s Law of Planetary Motion is this?