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 1971: from Jul 11, 1971, 06:31 UTC at 21°58′ Aquarius until Sep 9, 1971, 13:51 UTC at 11°53′ Aquarius.
| Stations retrograde | At | Stations direct | At | Days | Arc | Pre-shadow from | Post-shadow to |
|---|---|---|---|---|---|---|---|
| Jul 11, 1971, 06:31 UTC | 21°58′ Aquarius | Sep 9, 1971, 13:51 UTC | 11°53′ Aquarius | 60.31 | 10.07° | 11°53′ Aquarius | 21°58′ Aquarius |
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