Retrograde periods for Mercury, Venus, Mars, Jupiter and Saturn. Rahu and Ketu are always retrograde by convention.
1 retrograde period in 2015
121 days in Karka
3 retrograde periods in 2015
21 days in Makara
24 days in Vrishabha
22 days in Kanya
1 retrograde period in 2015
141 days in Vrishchika
1 retrograde period in 2015
43 days in Karka
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.
