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Donner toute sa place au cercle méridien de Toulouse-Jolimont à l'aide d'outils numériques : l'exemple des travaux du projet ReSeed

Abstract : Meridian circles are the main instrument for astrometry during the 19th century. With it, one can measure positions of stars, as well as clocks functioning. At the verge of the 20th century, an ambitious policy leads to a successive installation of meridian circles in every French institutional observatory, all of them made by the same builder, Eichens-Gautier. In Toulouse such an instrument is installed in 1891 in the observatory of Jolimont. Meridian circles perform measurements, but also need to be measured. They are fitted with scopes and accessories to measure the deviations affecting the measurements. Such indications could lead to post-processing corrections, or to the instrument calibration. The accessories are added gradually, and updated, according to technical and scientific progress. To understand the instrument, context is needed and the technical environment plays a key role in the proper functioning of the object. Looking at the telescope only, without its accessories, means ignoring vital components of its use, and eventually misunderstandings. With these incremental modifications, the meridian circles form a false-series of unique objects. The instrument’s need for context make their physical gathering impossible. Yet, the dynamics of the series, invisible through the life of an individual instrument, can only reveal itself through instruments comparisons. By the use of digital technologies, we were able to model the telescopes in their environment and to better understand the series. Digital twins, virtual models of the objects, built through aggregation of information and documents offer transverse vision, and embody this physically spread series.
Keywords : numérique
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Contributor : Loïc Jeanson <>
Submitted on : Tuesday, April 14, 2020 - 11:55:33 AM
Last modification on : Tuesday, January 5, 2021 - 4:26:08 PM


  • HAL Id : hal-02541941, version 1


Amandine Bérard, Loic Jeanson, Jean Davoigneau, Florent Laroche. Donner toute sa place au cercle méridien de Toulouse-Jolimont à l'aide d'outils numériques : l'exemple des travaux du projet ReSeed. Patrimoines du sud, Conseil Régional d'Occitanie, 2020, Patrimoines et numérique : un état de la recherche et des expérimentations, 12, pp.41. ⟨hal-02541941⟩



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