Basic Astronomy · 06🆓 Free preview Paid course Unlocked

Planetary Retrograde: Apparent Motion from Orbital Overtaking

6 min read

Learning objectives

✦Explain retrograde as apparent motion caused by Earth's motion relative to planets, identifying direct motion, stations, and retrograde in sequence
✦Use a top-down model to explain outer-planet retrograde around opposition and inner-planet retrograde around inferior conjunction
✦Compare retrograde frequency, duration, and extent and relate the chart's ℞ symbol to events in the sky

The previous lesson compared average ecliptic speeds, from the fastest Moon to the slowest Pluto. But averages hide an important exception: planets do not simply advance steadily. They slow, stop, appear to move backward, and then resume forward motion. A planet marked ℞ in a chart is in that apparent backward phase.

Do planets really reverse direction? If not, why do they seem to? Once you understand the astronomy, ‘Mercury retrograde’ will describe something concrete in the sky.

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This lesson is part of the “Natal Astrology” series. Purchase the series to unlock all lessons and receive 1000 AI credits.

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