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

    Research output: Contribution to journalArticlepeer-review

    Abstract

    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.
    Original languageEnglish
    Pages (from-to)770-775
    JournalJournal of Astronomical History and Heritage
    Volume24
    Issue number3
    Publication statusPublished - 2021

    Subject classification (UKÄ)

    • Astronomy, Astrophysics and Cosmology

    Free keywords

    • Time
    • Clock
    • Longitude
    • Jesuits
    • China

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