Mercury Retrograde Dates and Checker

When does Mercury go retrograde, and is it retrograde on a date you care about? The station dates below come from NASA JPL's Horizons ephemeris; the checker computes any date live.

For entertainment and self-reflection: Retrograde motion is a real optical effect; the idea that it disrupts communication or technology is astrological folklore with no evidence behind it. Nothing on this page is a prediction, and it is not financial, medical, psychological or legal advice. Use it as a prompt for thought, not as a basis for decisions.

Mercury retrograde periods, 2025 to 2028

Times are rounded to the nearest hour, given in Universal Time with US Pacific time underneath. The degrees show where Mercury stood in the tropical zodiac when it turned retrograde and when it turned direct again.

Source: NASA JPL Horizons, geocentric apparent ecliptic longitude of Mercury at hourly intervals, stations found as turning points. Retrieved October 24, 2026.

What "retrograde" actually means

Planets normally drift eastward against the background stars from night to night. Several times a year Mercury appears to stop, reverse and move westward for about three weeks before stopping again and resuming its normal direction. Astronomers call this apparent retrograde motion. Mercury does not really reverse; it is an effect of perspective. Mercury orbits the Sun in just 88 days, much faster than Earth. When it swings around the near side of its orbit, passing between Earth and the Sun (an "inferior conjunction"), its sideways motion as seen from Earth briefly runs the other way, much as a fast car you pass on the freeway seems to slide backwards against the distant hills.

Because the geometry repeats every 116 days or so (Mercury's synodic period), there are three, and occasionally four, retrograde periods each year, each lasting about 21 to 24 days. The moments when Mercury seems to stand still are called stations: the station retrograde at the start and the station direct at the end.

How these dates were calculated and checked

We did not copy these dates from an astrology calendar. We downloaded Mercury's position from NASA's Jet Propulsion Laboratory Horizons system, the same ephemeris service used by observatories and spacecraft navigators, at one-hour intervals from December 2024 to January 2029. A station is the moment Mercury's ecliptic longitude stops increasing and starts decreasing, or the reverse, so each turning point was located and refined by fitting a curve through the neighbouring hours. We then ran the same search with the Astronomy Engine library that powers the date checker above: all 27 stations agreed with the JPL-based times to within six minutes.

Station times have a natural fuzziness. Near a station Mercury moves less than a few arcseconds per hour, so a time quoted to the minute is mathematically precise but practically meaningless. Different calendars may differ by an hour or so, and the calendar date can change depending on your time zone. That is why the table shows both UTC and Pacific time.

Worked example

Enter October 30, 2026. The checker reports that Mercury is retrograde, in Scorpio, during the period that began on October 24, 2026 and ends on November 13. Mercury stationed retrograde at about 07:00 UTC on October 24, 2026, just after midnight Pacific time, so in Las Vegas the retrograde began in the first minutes of that day. Now enter December 1, 2026. Mercury is direct, and the checker shows the next retrograde beginning on February 9, 2027, in Pisces.

Where the folklore comes from

Ancient astronomers noticed retrograde loops thousands of years ago, and explaining them drove the history of astronomy. Ptolemy's epicycles in the second century AD were designed to reproduce the loops, and Copernicus's demonstration in 1543 that they arise naturally if Earth orbits the Sun was one of the strongest arguments for his system. In astrology, a retrograde planet was traditionally considered weakened. Mercury rules communication, travel, commerce and, in modern interpretation, technology, so its retrograde periods became associated with misunderstandings, delays and broken gadgets.

The modern popularity of "Mercury retrograde" as a scapegoat took off in the late twentieth century, with almanac columns and later social media. Searches for it spike sharply each time one begins. There is no evidence that emails fail, contracts collapse or phones break more often during these periods. The appeal is understandable, though: a shared, harmless explanation for a frustrating week.

Using it for planning and reflection

If you enjoy the tradition, Mercury retrograde can be a useful excuse to do sensible things that are easy to put off: back up your phone and computer, double-check travel bookings, reread important emails before sending them, and revisit unfinished projects (astrologers like words with "re-": review, revise, reconnect). None of that needs the planets, but a reminder three times a year does no harm. What we would not do is delay a real decision, such as signing a lease, starting a job or buying a home, because of a retrograde.

For sky-watchers there is a real bonus: Mercury is hard to see because it never strays far from the Sun, and the best chances come at its greatest elongations, which fall shortly before or after each retrograde period.

Frequently asked questions

Sources and further reading

• NASA JPL Horizons System, ssd.jpl.nasa.gov/horizons (Mercury geocentric ecliptic longitude, hourly, retrieved 2026-10-24).
• Astronomy Engine by Don Cross (MIT licence), github.com/cosinekitty/astronomy.
• NASA Science, "Mercury: Facts" (orbital period 88 days), science.nasa.gov.
• Wikipedia: "Apparent retrograde motion", "Mercury (planet)", "Deferent and epicycle".
• Copernicus, N. De revolutionibus orbium coelestium, 1543, Book V.

By Stanley King · About 8calc · Last reviewed October 2026

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