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Mercury retrograde 1917: 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 1917: from Jan 10, 1917, 06:50 UTC at 5°40′ Aquarius until Jan 30, 1917, 20:43 UTC at 19°38′ Capricorn; from May 5, 1917, 15:47 UTC at 29°30′ Taurus until May 29, 1917, 12:11 UTC at 20°35′ Taurus; from Sep 5, 1917, 17:37 UTC at 4°05′ Libra until Sep 28, 1917, 02:56 UTC at 19°30′ Virgo; from Dec 25, 1917, 04:44 UTC at 19°43′ Capricorn until Jan 14, 1918, 06:33 UTC at 3°28′ Capricorn.

Mercury retrograde periods in 1917

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
Jan 10, 1917, 06:50 UTC	5°40′ Aquarius	Jan 30, 1917, 20:43 UTC	19°38′ Capricorn	20.58	16.02°	19°38′ Capricorn	5°40′ Aquarius
May 5, 1917, 15:47 UTC	29°30′ Taurus	May 29, 1917, 12:11 UTC	20°35′ Taurus	23.85	8.91°	20°35′ Taurus	29°30′ Taurus
Sep 5, 1917, 17:37 UTC	4°05′ Libra	Sep 28, 1917, 02:56 UTC	19°30′ Virgo	22.39	14.58°	19°30′ Virgo	4°05′ Libra
Dec 25, 1917, 04:44 UTC *	19°43′ Capricorn	Jan 14, 1918, 06:33 UTC	3°28′ Capricorn	20.08	16.24°	3°28′ Capricorn	19°43′ Capricorn

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

Sign changes during retrograde

Instant (UTC)	From	To
Jan 18, 1917, 04:29 UTC	Aquarius	Capricorn
Sep 14, 1917, 12:12 UTC	Libra	Virgo

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