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Mercury retrograde 1918: 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 1918: from Dec 25, 1917, 04:44 UTC at 19°43′ Capricorn until Jan 14, 1918, 06:33 UTC at 3°28′ Capricorn; from Apr 16, 1918, 15:28 UTC at 10°25′ Taurus until May 10, 1918, 09:46 UTC at 0°23′ Taurus; from Aug 19, 1918, 08:32 UTC at 16°53′ Virgo until Sep 11, 1918, 12:30 UTC at 3°14′ Virgo; from Dec 9, 1918, 02:06 UTC at 3°51′ Capricorn until Dec 28, 1918, 21:10 UTC at 17°32′ Sagittarius.

Mercury retrograde periods in 1918

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 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
Apr 16, 1918, 15:28 UTC	10°25′ Taurus	May 10, 1918, 09:46 UTC	0°23′ Taurus	23.76	10.03°	0°23′ Taurus	10°25′ Taurus
Aug 19, 1918, 08:32 UTC	16°53′ Virgo	Sep 11, 1918, 12:30 UTC	3°14′ Virgo	23.17	13.65°	3°14′ Virgo	16°53′ Virgo
Dec 9, 1918, 02:06 UTC	3°51′ Capricorn	Dec 28, 1918, 21:10 UTC	17°32′ Sagittarius	19.79	16.31°	17°32′ Sagittarius	3°51′ Capricorn

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

Sign changes during retrograde

Instant (UTC)	From	To
Dec 15, 1918, 13:03 UTC	Capricorn	Sagittarius

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