Retrograde periods for Mercury, Venus, Mars, Jupiter and Saturn. Rahu and Ketu are always retrograde by convention.
3 retrograde periods in 2026
23 days in कुम्भ
24 days in मिथुन
20 days in तुला
1 retrograde period in 2026
137 days in मीन
1 retrograde period in 2026
42 days in तुला
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.