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Transits of Mercury and General Relativity from Observations, and the 2019 November 11 Transit
JOA 2019, Vol. 9, No. 3, Page 8 Author(s): Constantino Sigismondi, Luigi Bordoni, Jay PasachoffAbstract: The transit of Mercury of November 11 2019, provides the opportunity to test amethod of measuring the solar diameter and shape (due to the oblateness) better than 0.1, or 70 km of resolution on the Sun. Beyond the General Relativity implications of Mercury itself, we exploit the most precise ephemerides to achieve 0.1 with ground-based instruments of the solardiameter, of which monitoring the secular variations (related to our climate), as well as transient variations as potential proxies of major flares and Coronal Mass Ejections (to predict space weather).