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 1918: from Feb 3, 1918, 23:01 UTC at 3°04′ Libra until Apr 25, 1918, 16:44 UTC at 13°51′ Virgo.
| Stations retrograde | At | Stations direct | At | Days | Arc | Pre-shadow from | Post-shadow to |
|---|---|---|---|---|---|---|---|
| Feb 3, 1918, 23:01 UTC | 3°04′ Libra | Apr 25, 1918, 16:44 UTC | 13°51′ Virgo | 80.74 | 19.22° | 13°51′ Virgo | 3°04′ Libra |
| Instant (UTC) | From | To |
|---|---|---|
| Feb 25, 1918, 19:00 UTC | Libra | Virgo |
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