逆行的時候行星真的在倒退嗎？

沒有。行星始終沿同一方向繞行太陽。逆行是從地球上看到的視覺效果，因為地球和那顆行星的公轉速度不同，兩者相對位置改變，使它在背景恆星前看起來往反方向移動。

水星逆行多久一次、持續多久？

一年大約三到四次，每次約三週。前後各有幾天行星看起來幾乎不動，那就是停滯點。確切日期可查星曆或 NASA 的公開行星位置資料。

水星逆行會讓電子產品壞掉或班機延誤嗎？

目前沒有任何已確立的物理機制可以說明逆行會影響電子設備、交通或通訊。本文把天文現象與占星實務分開說，不主張後者能預測事件。重要的行程與決定，請照一般常理安排。

Does a planet really move backwards when retrograde?

No. A planet keeps orbiting the Sun in the same direction throughout. Retrograde motion is an appearance from Earth: because the two planets orbit at different speeds, their relative positions shift and the planet seems to track backwards against the background stars.

How often is Mercury retrograde, and for how long?

Roughly three to four times a year, for about three weeks each time. For a few days before and after, the planet appears almost motionless; those are the station points. Exact dates come from an ephemeris or from NASA's public planetary position data.

Does Mercury retrograde break electronics or delay flights?

There is no established physical mechanism by which retrograde motion affects electronics, travel or communication. This article describes the astronomy and the interpretive practice separately and does not claim the latter predicts events. Plan important trips and decisions on ordinary practical grounds.

逆行是什麼意思？水星逆行到底在說什麼

作者：Wei Chun Chuang・2026-10-24

「水星逆行」大概是最常被提到、也最常被誤解的占星名詞。這篇先把天文現象講清楚，再分開說明占星實務上怎麼讀逆行，最後老實說明兩者之間沒有已確立的因果關係。

行星並沒有倒退

先把最重要的一句話說完：行星從來沒有反向繞行太陽。它們始終沿同一方向前進，從沒有停下來，也沒有掉頭。

逆行是「視運動」，也就是從地球上看出來的方向。我們是站在一顆同樣在移動的行星上觀測另一顆移動的行星，看到的只有兩者的相對位置。當這個相對位置的變化方向改變時，那顆行星在背景恆星前看起來就會往反方向走一段，這就叫逆行。

為什麼會看起來往回走？

原因是兩顆行星的公轉速度不同。離太陽越近，繞行越快。

外行星（火星、木星、土星等）繞得比地球慢。當地球從內側超過它時，從地球看它就會在一段時間內向後退。這就像在公路上超過一輛慢車，那輛車相對於遠方山景看起來是往後退的。
內行星（水星、金星）繞得比地球快。當它從內側超過地球時，同樣會出現這種相對方向的反轉。

兩種情況的機制相同：都是相對速度造成的視覺反轉，不是行星本身改變了運動方向。

水星逆行多久一次？

水星離太陽最近、繞行最快，所以它追上地球的頻率最高。一年大約會出現三到四次逆行，每次持續約三週。相比之下，金星兩年才一次左右，火星大約每兩年一次，而更外側的行星每年都會有一段較長的逆行期。

確切日期可以查星曆（ephemeris），或直接用 NASA 公開的行星位置資料推算。

停滯點是什麼？

逆行不是突然開始的。在轉向前後，那顆行星的視運動會慢下來，有幾天看起來幾乎停在同一度數上，這叫「停滯」（station）。順行轉逆行前的那一刻叫逆行停滯，逆行轉回順行前的那一刻叫順行停滯。星曆上標的逆行起訖日期，指的就是這兩個停滯點。

占星實務怎麼讀逆行？

在占星傳統裡，一顆逆行的行星通常不被當成故障或失效，而是同一顆行星「轉向內部」或「重新經過一次」的狀態：原本向外表達的功能，變成向內整理、回顧、修訂。所以常見的讀法是重看、重談、重做，而不是不能做事。

本命盤上某顆行星逆行，講的是一種長期的傾向；而當下天空的逆行期，在實務上被當成一段適合回顧與收尾的時間。這兩者是不同層次的說法。

關於影響，要說清楚的事

這點必須直說：目前沒有任何已確立的物理機制，可以說明行星的視覺逆行會影響電子設備、交通、班機或通訊。把合約延誤、手機壞掉、訊息誤傳歸因於水星逆行，是一種事後歸因的敘事，不是可檢驗的因果。

所以這篇文章把兩件事分開寫：天文部分是可以觀測、可以計算、可以驗證的；占星實務部分是一套流傳下來的解讀語言，本站把它當成反思與自我觀察的工具來介紹，不主張它能預測事件。重要的行程、合約、醫療或財務決定，請依一般常理和專業意見處理，不要依逆行安排。

常見問題

逆行的時候行星真的在倒退嗎？: 沒有。行星始終沿同一方向繞行太陽。逆行是從地球上看到的視覺效果，因為地球和那顆行星的公轉速度不同，兩者相對位置改變，使它在背景恆星前看起來往反方向移動。
水星逆行多久一次、持續多久？: 一年大約三到四次，每次約三週。前後各有幾天行星看起來幾乎不動，那就是停滯點。確切日期可查星曆或 NASA 的公開行星位置資料。
水星逆行會讓電子產品壞掉或班機延誤嗎？: 目前沒有任何已確立的物理機制可以說明逆行會影響電子設備、交通或通訊。本文把天文現象與占星實務分開說，不主張後者能預測事件。重要的行程與決定，請照一般常理安排。

想看自己的星盤有沒有逆行行星？

想知道自己本命盤上有哪幾顆行星逆行，可以用時來－星座網頁版：免註冊、免登入、免費，會畫出你的本命盤並附上 36 堂課。另外還有一款 iPhone App 時來－星座，目前仍在開發中，尚未上架，不能下載。

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What does retrograde actually mean?

作者：Wei Chun Chuang・2026-10-24

Mercury retrograde is probably the most-mentioned and most-misunderstood term in astrology. This article explains the astronomy first, then describes separately how astrological practice reads a retrograde planet, and finally states plainly that no established causal link joins the two.

Planets do not move backwards

The most important sentence first: a planet never reverses its orbit. Planets keep travelling the same way round the Sun. They do not stop, and they do not turn around.

Retrograde motion is apparent motion, that is, the direction we see from Earth. We observe one moving planet while standing on another moving planet, so all we see is their relative position. When the direction of that relative change flips, the planet appears for a while to track backwards against the background stars. That is retrograde.

Why does it look like it goes back?

Because the two planets orbit at different speeds. The closer to the Sun, the faster the orbit.

Outer planets (Mars, Jupiter, Saturn and so on) orbit more slowly than Earth. As Earth overtakes one from the inside, that planet appears to fall backwards for a time. It is like passing a slow car on a highway: against distant hills, the car seems to slide backwards.
Inner planets (Mercury, Venus) orbit faster than Earth. When one of them overtakes Earth from the inside, the same reversal of relative direction occurs.

The mechanism is the same in both cases: a visual reversal produced by relative orbital speeds, not a change in how the planet is actually moving.

水星逆行多久一次？

Mercury is closest to the Sun and orbits fastest, so it catches up with Earth most often. It appears retrograde roughly three to four times a year, for about three weeks each time. Venus, by comparison, does so about once every two years, Mars about every two years, and the outer planets each have a longer retrograde stretch every year.

For exact dates, consult an ephemeris or work them out from NASA's public planetary position data.

What are the station points?

Retrograde motion does not begin abruptly. Before and after the turn, the planet's apparent motion slows until, for a few days, it seems to sit at nearly the same degree. That is a station. The moment before direct motion becomes retrograde is the retrograde station; the moment before it resumes forward motion is the direct station. The start and end dates printed in an ephemeris are those two station points.

How does astrological practice read it?

In the astrological tradition a retrograde planet is generally not treated as broken or disabled, but as the same planet turned inward or revisited: a function that normally expresses outward is instead reviewing, sorting and revising. So the usual reading is re-reading, re-negotiating and redoing, not being unable to act.

A planet retrograde in a natal chart is described as a long-standing disposition, while a current retrograde period in the sky is treated in practice as a stretch suited to review and to finishing things off. Those are two different levels of statement.

About effects, to be clear

This has to be said straight: there is no established physical mechanism by which a planet's apparent retrograde motion affects electronics, travel, flights or communication. Attributing a delayed contract, a dead phone or a misread message to Mercury retrograde is a narrative applied after the fact, not a testable cause.

So this article keeps the two apart. The astronomy is observable, calculable and verifiable. The astrological practice is an inherited language of interpretation, which this site introduces as a tool for reflection and self-observation, with no claim that it predicts events. Plan important trips, contracts, medical or financial decisions on ordinary practical grounds and on professional advice, not around a retrograde period.

常見問題

Does a planet really move backwards when retrograde?: No. A planet keeps orbiting the Sun in the same direction throughout. Retrograde motion is an appearance from Earth: because the two planets orbit at different speeds, their relative positions shift and the planet seems to track backwards against the background stars.
How often is Mercury retrograde, and for how long?: Roughly three to four times a year, for about three weeks each time. For a few days before and after, the planet appears almost motionless; those are the station points. Exact dates come from an ephemeris or from NASA's public planetary position data.
水星逆行會讓電子產品壞掉或班機延誤嗎？: There is no established physical mechanism by which retrograde motion affects electronics, travel or communication. This article describes the astronomy and the interpretive practice separately and does not claim the latter predicts events. Plan important trips and decisions on ordinary practical grounds.

See whether your chart has retrograde planets

To find out which planets are retrograde in your own natal chart, use the Shilai Astrology web version: free, no sign-up and no login, it draws your natal chart and comes with 36 lessons. There is also an iPhone app, 時來－星座, which is still in development, not yet released and not available to download.

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