From the Earth-based geocentric perspective a planet can appear to move backwards through the zodiac, i.e. in an opposite direction to its usual movement (direct motion). Before a planet changes its direction from either retrograde to direct or vice versa its motion becomes increasingly slower until it appears to come to a stop. This is called the stationary phase. The planets have different periods of retrograde motion: Mercury 3 times a year for 3 weeks, Venus roughly every 18 months for 40 to 44 days, Mars roughly every 26 months for 60 to 80 days, Jupiter roughly every 13 months for about 4 months, Saturn roughly every 12 1/2 months for about 4 1/2 months, Uranus roughly every 12 months for about 5 months, Neptune roughly every 12 months for 5 months and 6 days, Pluto roughly every 12 months for 5 to 6 months. Shifts from direct to retrograde as well as the minimum and maximum speeds correlate with changes in trend in financial markets. |