When Tarot cards are used in context or in a group, Reversals adds tonality, change in nuance and sophistication to the reading. When Reversals are equated with retrograde planets used in an astrological Tarot reading, the sophistication rises dramatically, particularly when we look at the planetary Major Cards.
A planet is retrograde when it appears to be moving backward in the Zodiac as seen from the Earth. A retrograde planet indicates that the affairs ruled by it are slowed down, and the querent is introspective about the situation. Retrograde planets show unresolved or unfinished business that have opportunities for being cleared, or that things are happening behind the scenes. From a Tarot point of view, we have indications of past actions. Once the planet resumes forward motion, the past experiences are given open expression.
A retrograde planet will influence the sign and house it resides with, aspects to other planets, and the zodiac signs it rules. Here is a rough guide to what retrograde planets can indicate:
In the astrological real world, the Sun and the Moon are never retrograde, so there is no astrological interpretation for them. As you can see, in an astrological context, Reversal/Retrograde cards have nothing like the negative connotations found in traditional tarot.
Keep a current Ephemeris to hand so you know when planets change direction - this may give you hints when making predictions.