Does Earth really corkscrew through space?

It is the same motion, seen from two places.

1. Ride along

   Watch from the Sun and it stands still. Earth goes round it once a year on a near-circle, about 940 million km long, at 29.8 km/s. This is the textbook picture.

2. Step off

   Watch from the Milky Way instead. The Sun is now moving, at about 230 km/s, and it carries the planets with it.

3. Add the two

   A point going round a circle whose centre moves steadily traces a helix. Each turn is as long as the distance the centre moves in one orbit, and as wide as the orbit.

Neither picture is wrong. A speed or a path is always measured against something: against the Sun the orbits are near-circles, against the galaxy’s centre they are coils. Nothing pulls the planets along behind the Sun. They keep orbiting it, and the whole system moves together.

Far more than most pictures show. In one year Earth goes round the Sun once, a loop of about 940 million km. In the same year, moving at about 230 km/s, the Sun carries it about 7.3 billion km, nearly eight times as far. So one turn of Earth’s coil is 7.3 billion km long and only 300 million km wide, the width of its orbit: 24 times longer than it is wide.

Drawn to scale and seen from the side, a year of Earth’s path is a gentle wave, almost a straight line. It looks like a tight corkscrew only when you see it nearly end-on, along the path, or when the Sun is slowed down, which is what most animations do. Over longer times the coils become too fine to see: a human lifetime of 80 years carries the Solar System about 580 billion km, and all the planets’ paths merge into one thread, the Sun’s own path.

The best-known one is DjSadhu’s 2012 “helical model” animation (YouTube), watched millions of times: the Sun streaks through space with the planets spiralling behind it. On 2 November 2026 a coded simulation of the same idea, posted by @PhilosophyOfPhy on X, went viral again.

The helix is real. When the 2012 animation spread, astrophysicist Rhys Taylor called that part perfectly correct. What he and Phil Plait objected to was the vortex: the animation draws the orbits face-on to the Sun’s motion, with the planets trailing behind it. In fact the plane of the planets’ orbits is tipped about 60° to the plane of the Milky Way, Astronomy magazine notes, and so about 60° to the Sun’s direction of travel. Plait’s point follows from that: the planets are sometimes ahead of the Sun and sometimes behind it. In the model Earth spends half of each year in front, up to about 75 million km ahead.

How long is one lap? About 230 million years, NASA says; Live Science quotes astronomer Keith Hawkins giving 220 to 230 million. On the way round, Earth circles the Sun about 230 million times.

1. 1 See

   Open Galactic Path Lab and tap Textbook view. Sun’s speed is 0: you ride along with the Sun. Earth goes round reads 1 loop · 940 million km and Coil: length ÷ width reads a circle.

2. 2 Change

   Tap One year, true scale. The Sun now moves at 230 km/s and the view turns side-on: The Sun moves reads 7.3 billion km and Coil: length ÷ width 24×, nearly a straight line. Then tap Viral vortex (squashed): orbits face-on and the Sun slowed to 28 km/s give the tight corkscrew of the animations, only 5.9× longer than wide.

3. 3 Understand

   Tap One year, true scale again and drag Orbit tilt from 60° to 90° and back to see what the real tilt changes. Then tap One galactic year: The Sun moves reads 176,000 light-years, Earth goes round 230 million loops, and the coils vanish into one thread around the galaxy.

Galactic Path Lab uses circular orbits at constant speeds; real ones are slightly elliptical, Mars’s by about 9%. It puts the Sun on a circular orbit around the galaxy at 230 km/s with a 230-million-year lap, NASA’s round figures; published speeds run from about 220 to 240 km/s and galactic years from about 220 to 250 million years. The real Sun also bobs up and down through the galaxy’s disc, a full cycle taking roughly 60 million years, which the model leaves out.

The paths are to scale, but the Sun and planets are drawn many times larger than they are, and the Milky Way is an illustration: its arms are not mapped, and only the Sun’s distance from the centre is real. The film uses short, credited excerpts of DjSadhu’s animation, a corrected animation by morn1415 (YouTube) and the @PhilosophyOfPhy post; the coils, the galaxy and the numbers come from the model.