Browse Transits

There are 14 objects associated with "1761".

Calibration table for the Marinoni position micrometer by J. Scherer

Calibration table for the Marinoni position micrometer by J. Scherer

On the last page of volume IV of the Records of the Specola di Bologna, dated May 1734, there is a calibration table for the micrometer written by Eustachio Manfredi (1674-1739), who was the first ast...

Clock

Clock

Clock by Thomas Tompion, London, ca. 1675.

As the most accurate clock at Harvard in 1761, this one-hundred-year old, "excellent pendulum clock" was taken to Newfoundland by John Winthrop to obser...

De Veneris ac Solis congressu. Observatio habita in astronomica specula Bononiensis Scientiarum Instituti die 5 Junii 1761.

De Veneris ac Solis congressu. Observatio habita in astronomica specula Bononiensis Scientiarum Instituti die 5 Junii 1761.

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 Philosophica...

Diagram of the 1761 transit by James Ferguson

Diagram of the 1761 transit by James Ferguson

This is a detail from a large folding plate in James Ferguson's Astronomy explained upon Sir Isaac Newton?s Principles. First published in 1756, Ferguson subsequently added material on the 1761...

Eustachio Zanotti (1709 - 1782)

Eustachio Zanotti (1709 - 1782)

The 1761 Venus transit was observed in Bologna by Eustachio Zanotti, director of the Observatory, founded in 1726 in the buiding of newborn Academy of Sciences. The Observatory tower today hosts the M...

James Ferguson's diagram of the 1761 transit from various stations

James Ferguson's diagram of the 1761 transit from various stations

James Ferguson was renowned for the clarity of his astronomical explanations, diagrams and models. This diagram shows the appearance of the 1761 transit as seen from several different sites: London, t...

Logbooks of the Bologna astronomical Observatory for the year 1761.

Logbooks of the Bologna astronomical Observatory for the year 1761.

The Zanotti’s observations are dated June 5th and not 6th: in fact, astronomical day started at the local noon. Morever, during all the 18th century and until 1866 (shortly after the birth of th...

Marinoni position micrometer by J. Scherer, Vienna, 1732: brass, length 24.5 cm

Marinoni position micrometer by J. Scherer, Vienna, 1732: brass, length 24.5 cm

It is almost certainly the only remaining example of the micrometers designed by Giovanni Giacomo Marinoni from Udine (1676-1755). Marinoni sent to Eustachio Manfredi (1674-1739), first Director of th...

Movable quadrant by S. Menini - Bologna, 1710: brass and iron, radius 100 cm.

Movable quadrant by S. Menini - Bologna, 1710: brass and iron, radius 100 cm.

This instrument was used in Bologna by Eustachio Zanotti in order to take the positions of Venus on the Sun during the 1761 transit. It is fitted with two telescopes, one fixed the other movable. It h...

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