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The Canberra Times
The Canberra Times

What does it mean to be in retrograde?

Sun Earth

Sometimes we hear that Mercury or Mars is in retrograde. But what does this actually mean?

Firstly, retrograde is a description of motion, where the orbital (or rotational) motion of an object is in the opposite direction of the central object (like our Sun). There is also prograde motion where the motion of the object is in the same direction.

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