Question

Which did Kepler notice about planetary motion that caused him to propose Kepler’s first law of orbital motion?

Answer 1

The motions of the planets  in the solar system made Keppler propose the laws of planetary motion.

Explanation:

• The motions of the planets  in the solar system made Keppler propose the laws of planetary motion.
• In simple words, Kepler's first law can be defined as all planets moved around the sun in the elliptical orbit having the sun as one of the foci.
• Kepler’s first law means that planets move throughout the Sun in elliptical orbits. An ellipse is a shape that follows a levelled circle.