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 3 times in 1921: from Feb 21, 1921, 23:12 UTC at 17°46′ Pisces until Mar 16, 1921, 08:55 UTC at 3°28′ Pisces; from Jun 25, 1921, 00:26 UTC at 20°51′ Cancer until Jul 19, 1921, 05:33 UTC at 11°09′ Cancer; from Oct 20, 1921, 00:00 UTC at 16°18′ Scorpio until Nov 9, 1921, 11:17 UTC at 0°25′ Scorpio.
| Stations retrograde | At | Stations direct | At | Days | Arc | Pre-shadow from | Post-shadow to |
|---|---|---|---|---|---|---|---|
| Feb 21, 1921, 23:12 UTC | 17°46′ Pisces | Mar 16, 1921, 08:55 UTC | 3°28′ Pisces | 22.4 | 14.29° | 3°28′ Pisces | 17°46′ Pisces |
| Jun 25, 1921, 00:26 UTC | 20°51′ Cancer | Jul 19, 1921, 05:33 UTC | 11°09′ Cancer | 24.21 | 9.70° | 11°09′ Cancer | 20°51′ Cancer |
| Oct 20, 1921, 00:00 UTC | 16°18′ Scorpio | Nov 9, 1921, 11:17 UTC | 0°25′ Scorpio | 20.47 | 15.89° | 0°25′ Scorpio | 16°18′ Scorpio |
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