Retrograde periods for Mercury, Venus, Mars, Jupiter and Saturn. Rahu and Ketu are always retrograde by convention.
4 retrograde periods in 2017
20 days in धनु
24 days in मेष
23 days in सिंह
20 days in वृश्चिक
1 retrograde period in 2017
123 days in कन्या
1 retrograde period in 2017
42 days in मीन
1 retrograde period in 2017
141 days in धनु
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.
