In 1977, Mercury has four retrograde periods: in Capricorn, Taurus, Virgo and Sagittarius. The year opens with a retrograde carried over from the year before; it ends on January 17. The last ends on December 31.
Retrograde periods in 1977
December 27, 1976 – January 17, 1977
Over
- Shadow begins
- Retrograde begins
- Turns direct
- Shadow ends
- Sign
- Capricorn
- Length
- 21 days
April 19 – May 13
Over
- Shadow begins
- Retrograde begins
- Turns direct
- Shadow ends
- Sign
- Taurus
- Length
- 24 days
August 22 – September 14
Over
- Shadow begins
- Retrograde begins
- Turns direct
- Shadow ends
- Sign
- Virgo
- Length
- 23 days
December 11 – December 31
Over
- Shadow begins
- Retrograde begins
- Turns direct
- Shadow ends
- Sign
- from Capricorn into Sagittarius
- Length
- 20 days