07 Book Activity 2 - Planetary Motion
Storyboard Text
- No, What is that? Can you explain it to me?
- Hi, let me ask you. Do you know what's kepler's planetary motion?
- Sure!
- In astronomy, kepler's law of planetary motion published by Johannes Kepler between 1609 and 1619, describe the orbits of planets around the Sun. The laws modified the heliocentric theory of Nicolaus Copernicus, replacing its circular orbits and epicycles with elliptical trajectories, and explaining how planetary velocities vary. There are three kinds of planetary motion
- Woah it has three kinds? What is it?
- 1. The law of orbits2. The law of equal areas3. The law of periods
- What does it means?
- 1. Every planet's orbit is an ellipse with the sun at a focus.2. A line joining the sun and a planet sweeps out equal areas in equal times 3. The square of planet's orbital period is proportional to the cube of the semi major axis of its orbit.
- Why Kepler's law of planetary motion important?
- Kepler's laws of planetary motion mark an important turning point in the transition from geocentrism to heliocentrism. They provide the first quantitative connection between the planets, including earth. But even more they mark a time when the important questions of the times were changing.
- Why do we need to understand Kepler's Law of Planetary Motion?
- Three laws devised by Johannes Kepler to define the mechanics of planetary motion. This law identifies that the distance between the Sun and Earth is constantly changing as the Earth goes around its orbit.
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