Planetary configurations keywords (i.e., Planetary configurations keywords): apparent retrograde motion (often abbreviated to "retrograde motion"), conjunction (inferior conjunction, superior conjunction), ecliptic, elongation (greatest eastern elongation, greatest western elongation), opposition, orbit (circular orbit, eccentricity, elliptical orbit, mean orbital radius, orbital period), planet, planetary configuration, position angle, prograde motion, quadrature, retrograde motion, syzygy, zodiac, etc.
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File: Celestial sphere file: planetary_configurations_keywords.html.