Retrograde periods for Mercury, Venus, Mars, Jupiter and Saturn. Rahu and Ketu are always retrograde by convention.
3 retrograde periods in 1975
21 days in Makara
24 days in Vrishabha
21 days in Kanya
1 retrograde period in 1975
43 days in Simha
1 retrograde period in 1975
118 days in Meena
1 retrograde period in 1975
75 days in Vrishabha
Rahu and Ketu are the lunar nodes and are always Vakri (retrograde). They move backwards through the zodiac at roughly 1.5° per month and change Rashi only once every ~18 months.
