Physics – History and Philosophy of Physics
Scientific paper
2005-01-17
Physics
History and Philosophy of Physics
12 pages, 5 figures. To be published in Nuovo Cimento B
Scientific paper
10.1393/ncb/i2005-10147-7
The non-spherical shape of the Sun has been invoked to explain the anomalous precession of Mercury. A brief history of some methods for measuring solar diameter is presented. Archimedes was the first to give upper and lower values for solar diameter in third century before Christ; we also show the method of total eclipses, used after Halley's observative campaign of 1715 eclipse; the variant of partial eclipses useful to measure different chords of the solar disk; the method of Dicke which correlates oblateness with luminous excess in the equatorial zone.
Oliva Pietro
Sigismondi Costantino
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