At 11:07 local time on April 8, 2024, the moon's shadow touched down on Mexico's Pacific coast near Mazatlan, and for four minutes the midday sky went dark. Temperatures dropped. Birds fell silent. Across a path up to 200 kilometers wide stretching from Sinaloa to Newfoundland, roughly 44 million people in the path of totality looked up and watched the sun vanish behind the moon. The Great North American Eclipse was the most-watched total solar eclipse in history -- not because it was the longest or the rarest, but because its path cut directly through some of the continent's most populated regions.
The moon's apparent diameter during this eclipse was 5.5 percent larger than average, a consequence of occurring just one day after perigee -- the point in the moon's orbit nearest to Earth. This proximity produced a magnitude of 1.0566 and a maximum totality of four minutes and 28 seconds, recorded near the small town of Nazas in the state of Durango, Mexico. The path of totality first crossed land at Mazatlan, Sinaloa, then swept through northern Nayarit, across Durango and the city of Durango itself, into Coahuila including the cities of Torreon and Monclova, and briefly touching Nuevo Leon. For the six Mexican states in the path, the eclipse was a once-in-a-generation event that drew international visitors to locations most had never heard of.
After crossing the Rio Grande, the shadow entered Texas and did not let go of the continent for another two hours. Totality darkened San Antonio, Austin, Dallas, and Fort Worth before sweeping through Arkansas, where Hot Springs and Little Rock found themselves under the moon's umbra. The path continued through southern Missouri, crossed the full breadth of Indiana, and clipped the shores of Lake Erie in Ohio, covering Cleveland. In upstate New York, Buffalo, Rochester, Syracuse, and Plattsburgh all fell within the zone. The eclipse crossed into Canada through southern Ontario -- Hamilton, Niagara Falls, Kingston -- then passed through Montreal and southern Quebec, New Brunswick, Prince Edward Island, and finally Cape Breton in Nova Scotia, where the shadow departed North America over the Atlantic.
A total solar eclipse occurs when the moon passes between Earth and the sun, and its apparent diameter is large enough to block the entire solar disk. What makes each eclipse unique is geometry: the moon's orbit is elliptical, so its apparent size varies, and the alignment must be precise enough that the umbral shadow actually reaches Earth's surface. This eclipse occurred at the moon's ascending node. The shadow's ground speed varied from roughly 2,500 km/h at first contact to over 5,000 km/h as it departed the continent at an oblique angle. Scientists deployed instruments along the path to study the sun's corona -- the superheated outer atmosphere visible only during totality -- and solar prominences, the arcs of plasma that leap from the surface. Amateur astronomers numbered in the millions.
The 2024 eclipse belonged to Solar Saros 139, a family of eclipses that produces a total eclipse roughly every 18 years. Its predecessor was the total eclipse of March 29, 2006, which crossed Africa and Turkey; its successor will arrive on April 20, 2042, crossing East Asia and the western Pacific. For North America, the next comparable event will not come until August 23, 2044, when a total eclipse crosses western Canada and Montana. The 2024 eclipse also intersected the path of the August 21, 2017 Great American Eclipse at two points, creating a narrow zone in southern Illinois and Missouri that experienced totality twice in seven years -- an occurrence so rare that some eclipse chasers spent years planning to witness both from the same hilltop.
The eclipse's path of greatest duration centered near Nazas, Durango, at approximately 25.29N, 104.12W. For a flight-oriented perspective, the shadow entered Mexico at Mazatlan (MMMZ) and could be traced northeast across the Sierra Madre to Torreon (MMTC) and Monclova, then across the Rio Grande into Texas. Key airports along the US path include San Antonio (KSAT), Dallas-Fort Worth (KDFW), Little Rock (KLIT), Indianapolis (KIND), Cleveland (KCLE), and Buffalo (KBUF). The path of totality was approximately 200 km wide at its widest point (near Mazatlan at first landfall). Best context altitude: 30,000-40,000 ft for the curvature of the shadow's path across the continent.