The Tsuchinshan-ATLAS comet, also named C/2023 A3, will reach its closest approach to the Sun, or perihelion, on Friday, September 27, 2024, at a distance of 59 million kilometers. As the comet journeys through the inner solar system, it offers an impressive display.... In the United States... From September 27 to September 30, the comet will be best observed in the southeastern sky, about an hour before dawn.... ...the comet will be visible again in mid-October. On October 13, it will be at its closest to Earth, around 71 million kilometers away, and will be observable after sunset, looking west....