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The Measurement of the Solar Diameter with the Partial Eclipse on 2025 March 29: What We Learned from the Observations
JOA 2025, Vol. 15, No. 3, Page 10 Author(s): Costantino Sigismondi et al.Abstract: The recent total eclipses (2013-2021) observed with increasing technological efforts, showed a rise of the solar diameter at 1 AU from 1919.26”(1891) to 1919.98” (2021) or the solar radius from 959.63” to 959.99”. In this paper we present the data of the last partial eclipse of 2025_March 29. The sudden change of luminosity as consequence of the totality is not present, and the only way to overcome the atmospheric turbulence is to fit with a parabola, the lunar profile’s progression. These observations, possible thanks to a timely IOTA/ES Call for Observations, and their analysis are presented: the solar radius results as 959.73”±0.2” showing the potential of this method.