De Veneris ac Solis congressu. Observatio habita in astronomica specula Bononiensis Scientiarum Instituti die 5 Junii 1761.
Object notes Associations
The Bologna observations were published on the proceedings of the Science Academy (Commentarii dell?Accademia delle Scienze di Bologna) in 1767 and were reported by Nathaniel Bliss on the Philosophical Transactions. The astronomers measured 14 positions of Venus on the Sun during the transit and the final contact times, internal and external: the first contacts were not visible from the Bologna latitude. These data were used to obtain the path of the planet and its orbital parameters. It is worth noting that Zanotti did not use the 1761 data for a comparison with other works (as many astronomers did). in order to reckon a value for te solar parallax. On the other side, his observations were examined by others: Alexandre Pingr? in 1765, engaged a heated debate against Zanotti and Canterzani about the reliability of their results. Today we can say that the Bologna data weren?t worse than the others of the same epoch.
E. ZANOTTI: ?De Veneris ac Solis congressu. Observatio habita in astronomica specula Bononiensis Scientiarum Instituti die 5 Junii 1761?, Commentarii dell'Istituto delle Scienze, Bologna, 1767, Tomo V, Parte I, pag. 126.
N. BLISS: ?An account of a printed memoir [?] intituled de Veneris ac Solis congressu [?]?, Philosophical Transactions of the Royal Society, Vol. 52, Londra, 1761, pag. 399.
Object contributed by Museo della Specola, Department of Astronomy, Universit? di Bologna