Mercury retrograde
2026 & 2027

Mercury never moves backward. Seen from Earth, our planet regularly overtakes faster-moving Mercury on the inside lane — and for about three weeks Mercury appears to run backward, the way a train out the window seems to slip back when a faster one passes it. Astronomically it is an optical illusion. Astrologically the period is read as an invitation to revisit Mercury's themes — talking, thinking, tech, travel — calmly, rather than charging blindly ahead.

Because Mercury orbits the Sun in just 88 days, this happens three to four times a year, for roughly three weeks each time. The dates are fixed years in advance — they follow purely from the orbits, which is why we compute them here with the Swiss Ephemeris engine instead of copying them.

The three stages of every phase

• Pre-shadow (about 2 weeks before) — Mercury already travels through the stretch of the zodiac it is about to re-cross backward. Themes that surface now often return during the retrograde.
• The retrograde itself (about 3 weeks) — from standstill ("station") to turnaround. The days right around the two stations are considered the most noticeable — plans stall, messages cross.
• Post-shadow (about 2 weeks after) — Mercury moves forward again and retraces the ground it covered. A good time to sort out what the retrograde clarified.

What the sign of the phase tells you

Each phase falls in a zodiac sign (listed with every phase at the top of this page). That sign's element colours the theme:

How strongly you feel a phase depends on your own chart: it lands in one of your twelve houses — a concrete area of life. Your free birth chart shows you which one, and your personalized daily horoscope shows what today's sky is doing to your chart. Every other sky date of the year — eclipses, full and new moons, sign changes — lives in the astrology calendar.