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 1991: from Oct 20, 1990, 19:30 UTC at 14°34′ Gemini until Jan 1, 1991, 12:50 UTC at 27°45′ Taurus.
| Stations retrograde | At | Stations direct | At | Days | Arc | Pre-shadow from | Post-shadow to |
|---|---|---|---|---|---|---|---|
| Oct 20, 1990, 19:30 UTC * | 14°34′ Gemini | Jan 1, 1991, 12:50 UTC | 27°45′ Taurus | 72.72 | 16.81° | 27°45′ Taurus | 14°34′ Gemini |
* period crosses a year boundary and is listed in both years.
| Instant (UTC) | From | To |
|---|---|---|
| Dec 14, 1990, 07:46 UTC | Gemini | Taurus |
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