Station instants computed with Swiss Ephemeris to the minute, in UTC. Mars is retrograde about 0.47 times a year for 58–81 days.
Mars is retrograde once in 1920: from Mar 15, 1920, 03:05 UTC at 9°06′ Scorpio until May 31, 1920, 22:25 UTC at 21°14′ Libra.
| Stations retrograde | At | Stations direct | At | Days | Arc | Pre-shadow from | Post-shadow to |
|---|---|---|---|---|---|---|---|
| Mar 15, 1920, 03:05 UTC | 9°06′ Scorpio | May 31, 1920, 22:25 UTC | 21°14′ Libra | 77.81 | 17.86° | 21°14′ Libra | 9°06′ Scorpio |
| Instant (UTC) | From | To |
|---|---|---|
| Apr 23, 1920, 20:29 UTC | Scorpio | Libra |
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