Retrograde: What Is Actually Happening in the Sky

Night after night the planets drift slowly eastward against the background stars, in the same direction as the Sun and Moon. Astrologers call that normal motion direct. Every so often a planet seems to slow, stop and drift back west for a few weeks or months before stopping again and carrying on. The backward stretch is retrograde motion, and the two stopping points are its stations.

The planet is doing nothing of the kind. Every planet circles the Sun in the same direction all the time. What changes is our viewpoint. We watch from a moving platform, Earth, and when we overtake another planet, or it overtakes us, the line of sight from us to it swings backward across the stars.

You have seen the same thing on a motorway. Pass a slower car and, for a moment, it seems to slide backward against the distant hills, even though both of you are driving forward. The figure below shows the real thing: Earth and Mars on their real orbits through the winter of 2026 to 2027, with the line of sight from Earth to Mars carried out to a ring of distant stars.

For the planets beyond Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto, we are the faster runner on the inside track. NASA gives Mars's year as 686.98 Earth days, so Earth laps it about every 780 days. Each lap produces a retrograde, centred on the moment Earth passes between Mars and the Sun. Astronomers call that moment opposition: the planet sits opposite the Sun in the sky, rises at sunset and is at its brightest. In this cycle the Sun is opposite Mars on February 19, 2027 and the two planets are closest the next day, 101.4 million km apart.

For Mercury and Venus it works the other way. They orbit inside Earth's path and move faster than we do, so they lap us. Their retrograde is centred on the moment they pass between Earth and the Sun. Mercury, the fastest planet, does this about three times a year: in 2027 it turns retrograde on February 9, June 10 and October 7. Our Mercury retrograde 2027 dates has every station.

The size of the backward loop depends on distance. A nearby planet swings across a wide arc of sky; a distant one barely shifts. Mars's 2027 loop covers about 19.5 degrees. Saturn's, later in 2027, covers under 7.

This retrograde is easy to follow with the naked eye, because Mars passes a bright star twice. On November 26, 2026 it slides about 1.7 degrees from Regulus, the brightest star in Leo, heading east. At that point Mars is a modest reddish point of magnitude 0.5.

Over the winter it brightens as Earth closes the gap. It stops on January 10, 2027 among the stars of Virgo, then starts to drift back west, and by its closest approach on February 20 it has brightened to magnitude minus 1.2, about five times brighter than it was in December. Opposite the Sun, it rises in the east as the Sun sets and is up all night. In February it loops back past Regulus, but well to one side, more than three degrees away.

On April 1 it stops again, in Leo, and turns east once more. On May 15 it passes Regulus a second time, now only 1.2 degrees away, and fades back toward its December brightness. Note where Mars sits against Regulus in November, February and May and you have drawn the loop yourself, with no instrument but a window.

Retrograde motion was one of the great puzzles of ancient astronomy. If the planets circled a fixed Earth, why would they ever stop and go back?

Greek astronomers answered with geometry. In the models that began with Apollonius and reached their best known form in Ptolemy's work in the second century, each planet rode on a small circle, an epicycle, whose centre in turn travelled around a larger circle, the deferent. As the small circle turned, the planet traced loops, and from Earth it seemed to go backward for part of each loop. The model was complicated, but it worked well enough to forecast planetary positions for centuries.

The simpler answer came with Copernicus in the 1500s. Put the Sun at the centre and let Earth move, and the loops appear on their own, as a side effect of one planet passing another. Retrograde was not understood to be an illusion until his time. Astrologers kept the word, and the observation, because the backward stretches are real features of the sky as seen from Earth, which is the viewpoint a birth chart is drawn from.

In Western astrology a retrograde planet is read as turning its themes inward. Mercury is the planet of messages, so a Mercury retrograde is read as a season of review, revision and revisiting old conversations. Mars is the planet of drive, so a Mars retrograde is read as energy going back over old ground, a stretch for reconsidering where effort goes. Astrologers also mark a shadow: the weeks before the first station when the planet crosses the degrees it will later retrace, and the weeks after the second when it crosses them for the third time. For Mars in this cycle the shadow runs from November 5, 2026 to June 8, 2027.

Astrologers give the two stations particular weight. In the sky a stationing planet barely moves for days, so it lingers on one degree, and astrologers read a planet standing still as its themes at their most concentrated. Mars stands at 10 degrees of Virgo around January 10 and at 20 degrees of Leo around April 1. Anyone with a planet or an angle near those degrees in their birth chart is the reader astrologers say feels a station most directly, which is why the degree matters more than the date.

The 2027 Mars retrograde starts in Virgo and backs into Leo, so astrologers read it through the themes of both signs. The full dates, the shadow and what each sign's house is said to show are in Mars retrograde 2027. Venus took its own backward turn in 2026: see Venus retrograde 2026.

A birth chart records which planets were retrograde at the moment you were born. Our free birth chart reading marks each one with an R, and the planets guide explains what each planet is said to describe.