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 1903: from Feb 18, 1903, 15:34 UTC at 16°17′ Libra until May 9, 1903, 15:26 UTC at 27°26′ Virgo.
| Stations retrograde | At | Stations direct | At | Days | Arc | Pre-shadow from | Post-shadow to |
|---|---|---|---|---|---|---|---|
| Feb 18, 1903, 15:34 UTC | 16°17′ Libra | May 9, 1903, 15:26 UTC | 27°26′ Virgo | 79.99 | 18.85° | 27°26′ Virgo | 16°17′ Libra |
| Instant (UTC) | From | To |
|---|---|---|
| Apr 19, 1903, 20:47 UTC | Libra | Virgo |
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