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42 Years of Continuous Observations of the Solar Diameter from 1974 to 2015
Alexandre H. Andrei, Sergio C. Boscardin, Jucira L. Penna +2
Several group in the World followed the solar diameter with dedicated instruments, namely solar astrolabes, since 1974. Their data have been gathered in several observing stations…
The Reflecting Heliometer of Rio de Janeiro after 6 Years of Activity
Sergio C. Boscardin, Costantino Sigismondi, Jucira L. Penna +3
Started its regular, daily operational phase in 2011 and installed in 2009 by the occasion of the Symp264 in the XXVII IAU GA at Rio de Janeiro, the results so far obtained show th…
The Eddington's Eclispe and a Possible Replica of the Experiment of Light Bending
Costantino Sigismondi
The success of the first measurement of the light bending by the solar gravitational field is due to the particular stellar field during the Eddington's 1919 total eclipse of the S…
Optical Deformations in Solar Glass Filters for High Precision Astrometry
Costantino Sigismondi, Alexandre Humberto Andrei, Sérgio Calderari Boscardin +2
Measuring the solar diameter at all position angles gives the complete figure of the Sun. Their asphericities have implications in classical physics and general relativity, and the…
Transits of Venus and Solar diameter measures from ground: method and results from Athens (2004) and Huairou (2012)
Costantino Sigismondi, Anthony Ayiomamitis, Xiaofan Wang +3
The variation of the solar diameter in time and in position angle has implications in astrophysics and in general relativity, as the long series of studies attest. The Transits of…
Observational Accuracy of Variable Stars, Novae and Supernovae from Naked Eye to General Relativistic Standard: a Balance over Thousand SGQ Observations Sent to AAVSO
Costantino Sigismondi
The theory of General Relativity deals with very accurate measurements that show significant divergences from Newtonian predictions only with speeds near to the velocity of light.…