Retrograde periods for Mercury, Venus, Mars, Jupiter and Saturn. Rahu and Ketu are always retrograde by convention.
1 retrograde period in 1968
122 days in सिंह
3 retrograde periods in 1968
22 days in कुम्भ
24 days in मिथुन
21 days in तुला
1 retrograde period in 1968
137 days in मीन
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.
