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 1937: from Apr 14, 1937, 14:41 UTC at 5°32′ Sagittarius until Jun 27, 1937, 10:09 UTC at 19°32′ Scorpio.
| Stations retrograde | At | Stations direct | At | Days | Arc | Pre-shadow from | Post-shadow to |
|---|---|---|---|---|---|---|---|
| Apr 14, 1937, 14:41 UTC | 5°32′ Sagittarius | Jun 27, 1937, 10:09 UTC | 19°32′ Scorpio | 73.81 | 16.00° | 19°32′ Scorpio | 5°32′ Sagittarius |
| Instant (UTC) | From | To |
|---|---|---|
| May 14, 1937, 22:52 UTC | Sagittarius | Scorpio |
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