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Mercury retrograde 1977: exact dates and times

Station instants computed with Swiss Ephemeris to the minute, in UTC. Mercury is retrograde about 3.3 times a year for 19–24 days.

Mercury is retrograde 4 times in 1977: from Dec 28, 1976, 04:34 UTC at 23°19′ Capricorn until Jan 17, 1977, 08:01 UTC at 7°06′ Capricorn; from Apr 20, 1977, 02:09 UTC at 14°31′ Taurus until May 13, 1977, 20:51 UTC at 4°43′ Taurus; from Aug 22, 1977, 14:19 UTC at 20°47′ Virgo until Sep 14, 1977, 15:04 UTC at 6°57′ Virgo; from Dec 12, 1977, 02:11 UTC at 7°27′ Capricorn until Dec 31, 1977, 22:02 UTC at 21°08′ Sagittarius.

Mercury retrograde periods in 1977

All instants UTC. Arc = degrees travelled backwards between the two stations.

Stations retrograde	At	Stations direct	At	Days	Arc	Pre-shadow from	Post-shadow to
Dec 28, 1976, 04:34 UTC *	23°19′ Capricorn	Jan 17, 1977, 08:01 UTC	7°06′ Capricorn	20.14	16.22°	7°06′ Capricorn	23°19′ Capricorn
Apr 20, 1977, 02:09 UTC	14°31′ Taurus	May 13, 1977, 20:51 UTC	4°43′ Taurus	23.78	9.80°	4°43′ Taurus	14°31′ Taurus
Aug 22, 1977, 14:19 UTC	20°47′ Virgo	Sep 14, 1977, 15:04 UTC	6°57′ Virgo	23.03	13.83°	6°57′ Virgo	20°47′ Virgo
Dec 12, 1977, 02:11 UTC	7°27′ Capricorn	Dec 31, 1977, 22:02 UTC	21°08′ Sagittarius	19.83	16.31°	21°08′ Sagittarius	7°27′ Capricorn

* period crosses a year boundary and is listed in both years.

Sign changes during retrograde

Instant (UTC)	From	To
Dec 21, 1977, 07:18 UTC	Capricorn	Sagittarius

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