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 1999: from Mar 18, 1999, 13:41 UTC at 12°12′ Scorpio until Jun 4, 1999, 06:10 UTC at 24°27′ Libra.
| Stations retrograde | At | Stations direct | At | Days | Arc | Pre-shadow from | Post-shadow to |
|---|---|---|---|---|---|---|---|
| Mar 18, 1999, 13:41 UTC | 12°12′ Scorpio | Jun 4, 1999, 06:10 UTC | 24°27′ Libra | 77.69 | 17.75° | 24°27′ Libra | 12°12′ Scorpio |
| Instant (UTC) | From | To |
|---|---|---|
| May 5, 1999, 21:32 UTC | Scorpio | Libra |
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