The moving sky · A Zodiaris field guide
Mercury retrograde 2027
The full 2027 calendar, from the first shadow crossing to the final one. Compare every cycle, then open the details for its stations and zodiac positions.
| Cycle | Pre-shadow begins | Retrograde begins | Direct station | Post-shadow ends |
|---|---|---|---|---|
| Cycle 1 | 20° Aquarius 55′ | 5° Pisces 59′ | 20° Aquarius 55′ | 5° Pisces 59′ |
| Cycle 2 | 27° Gemini 28′ | 6° Cancer 22′ | 27° Gemini 28′ | 6° Cancer 22′ |
| Cycle 3 | 19° Libra 19′ | 4° Scorpio 56′ | 19° Libra 19′ | 4° Scorpio 56′ |
A closer look at each cycle
Cycle 1 · Feb 9, 2027 – Mar 3, 2027Cycle details
Pre-shadow begins
20° Aquarius 55′Direct motion · revisiting beginsRetrograde begins
5° Pisces 59′Apparent backward motion beginsDirect station
20° Aquarius 55′Forward motion · post-shadow beginsPost-shadow ends
5° Pisces 59′Direct motion · shadow complete
Mercury stations retrograde at 5° Pisces 59′ and direct at 20° Aquarius 55′. The pre-shadow starts at the direct station’s longitude; the post-shadow ends when Mercury returns to the retrograde station’s longitude.
Calculation version: retrogrades-v1-sky-calendar-v1.1-zodiaris-sky-v2.1-ae2.1.19Cycle 2 · Jun 10, 2027 – Jul 4, 2027Cycle details
Pre-shadow begins
27° Gemini 28′Direct motion · revisiting beginsRetrograde begins
6° Cancer 22′Apparent backward motion beginsDirect station
27° Gemini 28′Forward motion · post-shadow beginsPost-shadow ends
6° Cancer 22′Direct motion · shadow complete
Mercury stations retrograde at 6° Cancer 22′ and direct at 27° Gemini 28′. The pre-shadow starts at the direct station’s longitude; the post-shadow ends when Mercury returns to the retrograde station’s longitude.
Calculation version: retrogrades-v1-sky-calendar-v1.1-zodiaris-sky-v2.1-ae2.1.19Cycle 3 · Oct 7, 2027 – Oct 28, 2027Cycle details
Pre-shadow begins
19° Libra 19′Direct motion · revisiting beginsRetrograde begins
4° Scorpio 56′Apparent backward motion beginsDirect station
19° Libra 19′Forward motion · post-shadow beginsPost-shadow ends
4° Scorpio 56′Direct motion · shadow complete
Mercury stations retrograde at 4° Scorpio 56′ and direct at 19° Libra 19′. The pre-shadow starts at the direct station’s longitude; the post-shadow ends when Mercury returns to the retrograde station’s longitude.
Calculation version: retrogrades-v1-sky-calendar-v1.1-zodiaris-sky-v2.1-ae2.1.19Cycles are included when any part of their shadow interval overlaps 2027 in UTC. All four boundaries stay visible, including dates in neighboring years. Your time-zone choice changes the displayed dates and times, never the events themselves.
Reading this calendar
The retrograde interval starts at the retrograde station and ends at the direct station. Mercury is moving forward during both shadow periods. Each row gives the complete cycle, so a boundary in a neighboring year is kept with its other three dates.
The initial page uses UTC. After the page loads, the display uses your device’s time zone or your saved Sky preference; you can choose another zone at any time.
Calculation method & sources
Positions use the tropical zodiac and geocentric apparent ecliptic longitude calculated with Astronomy Engine 2.1.19. Stations are the same prepared events used by the Zodiaris Sky calendar. They are found from a sign change in longitude speed, sampled symmetrically one hour before and after the instant, with the time search narrowed to one second.
Shadow crossings use those station longitudes. Times are displayed to the minute; this display precision is not a claim of one-minute agreement with every ephemeris. Small differences can arise from the astronomical model, coordinate conventions and rounding.
Reference: Astronomy Engine documentation. Shadow convention and independent date checks: Cafe Astrology’s retrograde tables. No personal birth data is used.