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Chapter 4: Problem 11

What is the difference between the synodic period and the sidereal period of a planet?

Short Answer

Expert verified
The synodic period refers to the time taken by a celestial body to return to the same position relative to two other bodies. The sidereal period, on the other hand, refers to the time taken by the celestial body to make a complete rotation around its star, measured relative to distant stars. The synodic period differs from the sidereal period because both the Earth and the observed planet are in motion.

Step by step solution

01

Define Synodic Period

The synodic period is the time required for a celestial body to return to the same position relative to two other bodies. For a planet in our solar system, it would be measured as the time interval between two opposite positions of the Sun and Earth.
02

Define Sidereal Period

The sidereal period is the orbital period of a celestial body, measured relative to the stars. It represents the time the celestial body takes to make one complete revolution around its star.
03

Compare and Contrast

The key difference between these two periods lies in their reference point. The synodic period is referenced to the position between two other celestial bodies, whereas the sidereal period is referenced to stars. For a planet in our solar system, its synodic period usually differs from its sidereal period because both the Earth and the other planet are in motion.

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Most popular questions from this chapter

(a) Search the World Wide Web for information about Kepler. Before he realized that the planets move on elliptical paths, what other models of planetary motion did he consider? What was Kepler's idea of "the music of the spheres"? (b) Search the World Wide Web for information about Galileo. What were his contributions to physics? Which of Galileo's new ideas were later used by Newton to construct his laws of motion? (c) Search the World Wide Web for information about Newton. What were some of the contributions that he made to physics other than developing his laws of motion? What contributions did he make to mathematics?

Explain why the semimajor axis of a planet's orbit is equal to the average of the distance from the Sun to the planet at perihelion (the perihelion distance) and the distance from the Sun to the planet at aphelion (the aphelion distance).

(a) In what direction does a planet move relative to the horizon over the course of one night? (b) The answer to (a) is the same whether the planet is in direct motion or retrograde motion. What does this tell you about the speed at which planets move on the celestial sphere?

It is quite probable that within a few weeks of your reading this chapter one of the planets will be near opposition or greatest eastern elongation, making it readily visible in the evening sky. Select a planet that is at or near such a configuration by searching the World Wide Web or by consulting a reference book, such as the current issue of the Astronomical Almanac or the pamphlet entitled Astronomical Phenomena (both published by the U.S. government). At that configuration, would you expect the planet to be moving rapidly or slowly from night to night against the background stars? Verify your expectations by observing the planet once a week for a month, recording your observations on a star chart.

A general rule for superior planets is that the greater the average distance from the planet to the Sun, the more frequently that planet will be at opposition. Explain how this rule comes about.
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