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 1930: from Dec 18, 1930, 13:45 UTC at 16°49′ Leo until Mar 8, 1931, 13:51 UTC at 27°26′ Cancer.
| Stations retrograde | At | Stations direct | At | Days | Arc | Pre-shadow from | Post-shadow to |
|---|---|---|---|---|---|---|---|
| Dec 18, 1930, 13:45 UTC * | 16°49′ Leo | Mar 8, 1931, 13:51 UTC | 27°26′ Cancer | 80 | 19.38° | 27°26′ Cancer | 16°49′ Leo |
* period crosses a year boundary and is listed in both years.
| Instant (UTC) | From | To |
|---|---|---|
| Feb 16, 1931, 14:27 UTC | Leo | Cancer |
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