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 1975: from Jan 30, 1975, 10:48 UTC at 25°26′ Aquarius until Feb 20, 1975, 19:28 UTC at 9°58′ Aquarius; from May 29, 1975, 16:00 UTC at 23°36′ Gemini until Jun 22, 1975, 15:19 UTC at 15°01′ Gemini; from Sep 26, 1975, 23:46 UTC at 24°25′ Libra until Oct 18, 1975, 10:15 UTC at 9°05′ Libra.
| Stations retrograde | At | Stations direct | At | Days | Arc | Pre-shadow from | Post-shadow to |
|---|---|---|---|---|---|---|---|
| Jan 30, 1975, 10:48 UTC | 25°26′ Aquarius | Feb 20, 1975, 19:28 UTC | 9°58′ Aquarius | 21.36 | 15.48° | 9°58′ Aquarius | 25°26′ Aquarius |
| May 29, 1975, 16:00 UTC | 23°36′ Gemini | Jun 22, 1975, 15:19 UTC | 15°01′ Gemini | 23.97 | 8.58° | 15°01′ Gemini | 23°36′ Gemini |
| Sep 26, 1975, 23:46 UTC | 24°25′ Libra | Oct 18, 1975, 10:15 UTC | 9°05′ Libra | 21.44 | 15.34° | 9°05′ Libra | 24°25′ Libra |
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