Station instants computed with Swiss Ephemeris to the minute, in UTC. Mercury is retrograde about 3.3 times a year for 19–24 days.
Mercury is retrograde 3 times in 2015: from Jan 21, 2015, 15:54 UTC at 17°05′ Aquarius until Feb 11, 2015, 14:57 UTC at 1°18′ Aquarius; from May 19, 2015, 01:49 UTC at 13°09′ Gemini until Jun 11, 2015, 22:33 UTC at 4°34′ Gemini; from Sep 17, 2015, 18:09 UTC at 15°55′ Libra until Oct 9, 2015, 14:58 UTC at 0°54′ Libra.
| Stations retrograde | At | Stations direct | At | Days | Arc | Pre-shadow from | Post-shadow to |
|---|---|---|---|---|---|---|---|
| Jan 21, 2015, 15:54 UTC | 17°05′ Aquarius | Feb 11, 2015, 14:57 UTC | 1°18′ Aquarius | 20.96 | 15.79° | 1°18′ Aquarius | 17°05′ Aquarius |
| May 19, 2015, 01:49 UTC | 13°09′ Gemini | Jun 11, 2015, 22:33 UTC | 4°34′ Gemini | 23.86 | 8.58° | 4°34′ Gemini | 13°09′ Gemini |
| Sep 17, 2015, 18:09 UTC | 15°55′ Libra | Oct 9, 2015, 14:58 UTC | 0°54′ Libra | 21.87 | 15.02° | 0°54′ Libra | 15°55′ Libra |
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