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lars gislen

Lars Gislén

Retired, affiliated researcher

lars gislen

Seventeenth Century French Jesuit Longitude Determinations in Asia: : The art of Rectifying Clocks

Author

  • Lars Gislén

Summary, in English

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.

Department/s

  • Theoretical Particle Physics - Has been reorganised

Publishing year

2021

Language

English

Pages

770-775

Publication/Series

Journal of Astronomical History and Heritage

Volume

24

Issue

3

Document type

Journal article

Publisher

National Astronomical Research Institute of Thailand

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Time
  • Clock
  • Longitude
  • Jesuits
  • China

Status

Published

ISBN/ISSN/Other

  • ISSN: 1440-2807