What is retrograde motion? Group of answer choices How a planet brightness changes with time How a planets directions appears to change direction with respect to the stars How a planet brightness changes with time Talks about how the Earth’s axis tilts with time The Earth axis wobbles over 26,000 years

Retrograde motion is how a planet's direction appears to change direction with respect to the stars.

Explanation:

Retrograde motion is the retrograde movement that a celestial body appears to perform along the zodiacal belt due to the displacement of the observation point during the revolutionary motion of the Earth.

The cause of the apparent retrograde motion, therefore, is the same as the stellar parallax: the displacement, however, is much wider due to the proximity of the planets and the phenomenon is more conspicuous both because it is easily detectable as a relative movement to the stars and because it contrasts with the normal direction of travel of the ecliptic followed by the planets and apparently by the Sun.

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