When Observing Planetary Motions from Earth,the Phrase "Retrograde Motion" Refers

question 73

Multiple Choice

When observing planetary motions from Earth,the phrase "retrograde motion" refers to

• A) the motion of the planet away from Earth during part of its orbit.
• B) a slow eastward motion of the planet from night to night against the background stars.
• C) the apparent westward motion of the planet (along with the Sun,Moon,and stars)across the sky due to the rotation of Earth.
• D) a slow westward motion of the planet from night to night against the background stars.

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