Retrograde periods for Mercury, Venus, Mars, Jupiter and Saturn. Rahu and Ketu are always retrograde by convention.
4 retrograde periods in 2016
20 days in धनु
24 days in मेष
23 days in सिंह
20 days in धनु
1 retrograde period in 2016
122 days in सिंह
1 retrograde period in 2016
141 days in वृश्चिक
1 retrograde period in 2016
74 days in वृश्चिक
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.
