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 1980: from Feb 26, 1980, 01:32 UTC at 21°30′ Pisces until Mar 19, 1980, 13:59 UTC at 7°25′ Pisces; from Jun 28, 1980, 11:13 UTC at 25°07′ Cancer until Jul 22, 1980, 16:37 UTC at 15°12′ Cancer; from Oct 23, 1980, 01:58 UTC at 19°55′ Scorpio until Nov 12, 1980, 10:56 UTC at 3°59′ Scorpio.
| Stations retrograde | At | Stations direct | At | Days | Arc | Pre-shadow from | Post-shadow to |
|---|---|---|---|---|---|---|---|
| Feb 26, 1980, 01:32 UTC | 21°30′ Pisces | Mar 19, 1980, 13:59 UTC | 7°25′ Pisces | 22.52 | 14.10° | 7°25′ Pisces | 21°30′ Pisces |
| Jun 28, 1980, 11:13 UTC | 25°07′ Cancer | Jul 22, 1980, 16:37 UTC | 15°12′ Cancer | 24.23 | 9.92° | 15°12′ Cancer | 25°07′ Cancer |
| Oct 23, 1980, 01:58 UTC | 19°55′ Scorpio | Nov 12, 1980, 10:56 UTC | 3°59′ Scorpio | 20.37 | 15.94° | 3°59′ Scorpio | 19°55′ Scorpio |
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