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 2021: from Jan 30, 2021, 15:52 UTC at 26°29′ Aquarius until Feb 21, 2021, 00:52 UTC at 11°01′ Aquarius; from May 29, 2021, 22:34 UTC at 24°43′ Gemini until Jun 22, 2021, 22:00 UTC at 16°08′ Gemini; from Sep 27, 2021, 05:10 UTC at 25°28′ Libra until Oct 18, 2021, 15:17 UTC at 10°08′ Libra.
| Stations retrograde | At | Stations direct | At | Days | Arc | Pre-shadow from | Post-shadow to |
|---|---|---|---|---|---|---|---|
| Jan 30, 2021, 15:52 UTC | 26°29′ Aquarius | Feb 21, 2021, 00:52 UTC | 11°01′ Aquarius | 21.38 | 15.47° | 11°01′ Aquarius | 26°29′ Aquarius |
| May 29, 2021, 22:34 UTC | 24°43′ Gemini | Jun 22, 2021, 22:00 UTC | 16°08′ Gemini | 23.98 | 8.59° | 16°08′ Gemini | 24°43′ Gemini |
| Sep 27, 2021, 05:10 UTC | 25°28′ Libra | Oct 18, 2021, 15:17 UTC | 10°08′ Libra | 21.42 | 15.35° | 10°08′ Libra | 25°28′ Libra |
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