Article ID: CBB403211161

Seventeenth Century French Jesuit Longitude Determinations in Asia: On the Art of Rectifying the Clocks (2023)

unapi

Two methods of setting clocks to show correct time during the 17th century by French Jesuits in China are investigated and their computations and accuracy are analysed. These methods were used to rectify the clocks used for timings of eclipses of the Galilean moons or for lunar eclipses that in turn were used to determine geographical longitudes by Jesuit missionaries in Siam and China. It is found that the calculations needed, in spite of being quite complicated, were well done and very accurate.

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Authors & Contributors
Boistel, Guy
Gislén, Lars
Orchiston, Wayne
Orchiston, Darunee Lingling
Aubin, David
Betts, Jonathan
Journals
Journal of Astronomical History and Heritage
Annals of Science: The History of Science and Technology
East Asian Science, Technology, and Medicine
Journal for the History of Astronomy
Revue d'Histoire des Sciences
Acta Historica Astronomiae
Publishers
Robert Hale
Concepts
Astronomy
Eclipses; transits; occultations; conjunctions
Longitude and latitude
Astronomical observatories
Clocks and Watches
Science and politics
People
Boscovich, Ruggiero Giuseppe
Bouguer, Pierre
Fang, Yizhi
Harrison, John
Maskelyne, Nevil
Pezenas, P. (Esprit)
Time Periods
18th century
17th century
19th century
15th century
16th century
Renaissance
Places
China
Thailand
Great Britain
France
Vietnam
Southeast Asia
Institutions
Jesuits (Society of Jesus)
Great Britain. Board of Longitude
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