The article explains that the path of totality for solar eclipses is less precise than maps suggest due to uncertainties in the sun's size, moon's topography, and Earth's terrain, leading to a 'zone of uncertainty' at the edges where visibility of the eclipse's totality can vary. New methods and more accurate measurements are improving predictions, but small discrepancies still exist, especially near the edges.
Recent calculations show that the path of totality for the April 8, 2024, solar eclipse across North America is narrower than previously predicted, with maps off by as much as 610 meters due to a refined measurement of the sun's radius. Expert eclipse mapmaker John Irwin has produced a more accurate map, indicating that some observers along the edges of the eclipse path may miss the event. The sun's size is still being refined, and the new map takes into account surface details of Earth and its moon, providing a more precise guide for viewers.
Eclipse maps for the upcoming total solar eclipse on April 8 are inaccurate due to an incorrect value for the sun's diameter, affecting the path of totality and potentially causing locations on the edge to miss out on totality. A new map, using a slightly larger solar radius, has been published to rectify this issue. The moon's topography and the sun's non-sharp edge also contribute to the fuzzy and jagged edges of the path of totality, leading to grazing zones and uncertain experiences for spectators. Scientists are conducting experiments during the eclipse to measure the solar radius more accurately, with the hope of establishing a reliable methodology for future measurements.
As the annular solar eclipse approaches on October 14, two smartphone apps have been recommended for those interested in viewing the event. "OneEclipse" by Astronomers Without Borders provides information, maps, and simulations of the eclipse, with proceeds supporting the organization's astronomy initiatives. "Totality 3.0" by Big Kid Science offers easy access to eclipse maps and timings for multiple upcoming eclipses, including the annular solar eclipse in 2023 and the total solar eclipse in 2024. Both apps are available on iOS and Android platforms.
