Chinese historical records recorded Comet Swift–Tuttle in 69 BCE, long before the 2026 Perseids.
Swift–Tuttle is not known only from modern telescopic observations. Researchers matched ancient comet reports with the object’s calculated orbit, identifying likely observations in 69 BCE and 188 CE. Chinese records are especially valuable because historical Chinese astronomers kept systematic notes about unusual celestial objects, including comets and guest stars.
The ancient sightings matter because they extend the comet’s observation arc over more than two millennia. A longer observation arc improves calculations of the comet’s orbit and helps astronomers distinguish Swift–Tuttle from other comets with similar paths.
This record concerns the parent comet, not the first recorded sighting of the Perseid meteor shower. The shower and its source are related but historically different subjects: the comet’s ancient appearances were direct observations of a celestial body, whereas a meteor-shower record describes particles entering Earth’s atmosphere.