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 1939: from Jun 22, 1939, 18:33 UTC at 4°43′ Aquarius until Aug 23, 1939, 23:58 UTC at 23°55′ Capricorn.
| Stations retrograde | At | Stations direct | At | Days | Arc | Pre-shadow from | Post-shadow to |
|---|---|---|---|---|---|---|---|
| Jun 22, 1939, 18:33 UTC | 4°43′ Aquarius | Aug 23, 1939, 23:58 UTC | 23°55′ Capricorn | 62.23 | 10.79° | 23°55′ Capricorn | 4°43′ Aquarius |
| Instant (UTC) | From | To |
|---|---|---|
| Jul 21, 1939, 19:31 UTC | Aquarius | Capricorn |
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