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Mercury retrograde 1990: 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 1990: from Dec 30, 1989, 23:29 UTC at 25°53′ Capricorn until Jan 20, 1990, 04:32 UTC at 9°42′ Capricorn; from Apr 23, 1990, 06:54 UTC at 17°32′ Taurus until May 17, 1990, 02:02 UTC at 7°55′ Taurus; from Aug 25, 1990, 14:08 UTC at 23°34′ Virgo until Sep 17, 1990, 12:06 UTC at 9°35′ Virgo; from Dec 14, 1990, 21:09 UTC at 10°01′ Capricorn until Jan 3, 1991, 17:51 UTC at 23°43′ Sagittarius.

Mercury retrograde periods in 1990

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 30, 1989, 23:29 UTC *	25°53′ Capricorn	Jan 20, 1990, 04:32 UTC	9°42′ Capricorn	20.21	16.20°	9°42′ Capricorn	25°53′ Capricorn
Apr 23, 1990, 06:54 UTC	17°32′ Taurus	May 17, 1990, 02:02 UTC	7°55′ Taurus	23.8	9.61°	7°55′ Taurus	17°32′ Taurus
Aug 25, 1990, 14:08 UTC	23°34′ Virgo	Sep 17, 1990, 12:06 UTC	9°35′ Virgo	22.92	13.98°	9°35′ Virgo	23°34′ Virgo
Dec 14, 1990, 21:09 UTC *	10°01′ Capricorn	Jan 3, 1991, 17:51 UTC	23°43′ Sagittarius	19.86	16.30°	23°43′ Sagittarius	10°01′ Capricorn

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

Sign changes during retrograde

Instant (UTC)	From	To
Dec 25, 1990, 22:57 UTC	Capricorn	Sagittarius

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