The Sun is not stationary—it orbits the center of the Milky Way at about 230 kilometers per second, completing one full lap roughly every 225 to 250 million years. The commonly cited figure of 230 million years is a rounded estimate, supported by data from the Gaia mission and observations of the Sun’s position about 26,000 light-years from the galactic center. This timescale means that the last time the Solar System was in its current galactic position, Earth was in the Late Triassic period, around 230 million years ago, when the earliest dinosaurs like Eoraptor and Herrerasaurus first appeared in what is now Argentina.

However, the idea that we’ve 'returned' to the same spot is misleading. The Milky Way rotates differentially—inner stars move faster than outer ones—and its spiral arms are not fixed structures but wave patterns. Over hundreds of millions of years, the Sun also oscillates up and down through the galactic plane every 60 to 70 million years and shifts slightly in radius. This means that while angular position may align, the actual galactic neighborhood—nearby stars, gas clouds, and arm structure—is entirely different.

Some have speculated that the Sun’s galactic motion could influence life on Earth, such as periodic comet impacts linked to mass extinctions during plane crossings. But this remains a hypothesis without strong evidence, as extinction patterns and timing don’t align cleanly. The galactic year is best understood as a tool for grasping deep time, not a driver of biological change.