What is Mercury retrograde (水逆)? Dates for 2026–2027
Everyone talks about “Mercury retrograde” or “水逆” (shuǐnì) — but what is it, and does it affect your life? This article separates astronomical fact from belief.
Fact: Mercury doesn't really move backwards
Mercury always orbits the Sun in the same direction. What we call “retrograde” is apparent retrograde motion, an optical illusion caused by where we watch from on Earth. Mercury orbits inside Earth's orbit and moves faster; when it overtakes us, it appears to slide backwards against the background stars for a while — like watching a car you are passing from a faster one. It happens about 3–4 times a year and lasts roughly three weeks each time.
Dates for 2026–2027
| Starts appearing to move backwards | Moves forward again | Duration |
|---|---|---|
| 26 Feb 2026 | 21 Mar 2026 | about 23 days |
| 30 Jun 2026 | 24 Jul 2026 | about 24 days |
| 24 Oct 2026 | 13 Nov 2026 | about 20 days |
| 10 Feb 2027 | 3 Mar 2027 | about 22 days |
| 11 Jun 2027 | 5 Jul 2027 | about 24 days |
| 7 Oct 2027 | 28 Oct 2027 | about 21 days |
As of 31 Oct 2026 Mercury is in apparent retrograde and returns to forward motion around 13 Nov 2026. These figures are calculated from real planet positions; check an official source such as NARIT or an astronomical almanac before citing them.
In Western astrology some people believe that during Mercury retrograde communication, technology and travel tend to go wrong, so they avoid signing important contracts. On Chinese social media it is called “水逆” and used as a joke when things go badly. There is no scientific evidence that it affects real life, and no known physical force that could cause it.
If you want to see Mercury yourself
Mercury stays close to the Sun and is hard to spot. Look shortly after sunset or before sunrise, when it is far enough from the Sun, with a clear horizon. The “Tonight’s sky” page in this app tells you whether Mercury is visible tonight and where to look.
How often does it happen?
About 3–4 times a year, roughly three weeks each — a normal feature of its orbit.
Is Mercury really moving backwards?
No. It always moves forward; the backward motion is an illusion of perspective.