Archive for History of Exact Sciences

ISSNs: 0003-9519, 1432-0657

5 found

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  1.  6
    Lewis Caerleon and the equation of time: tabular astronomical practices in late fifteenth-century England.Laure Miolo & Stefan Zieme - 2024 - Archive for History of Exact Sciences 78 (2):183-243.
    The manuscripts and writings of the fifteenth-century astronomer and physician Lewis Caerleon (d. c. 1495) have been largely overlooked. To fill this gap, this article focuses on his writings and working methods through a case study of his canons and table for the equation of time. In the first part, an account of his life and writings is given on the basis of new evidence. The context in which his work on the equation of time was produced is explored in (...)
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  2.  9
    Levi-Civita simplifies Einstein. The Ricci rotation coefficients and unified field theories.Franco Cardin & Rossana Tazzioli - 2024 - Archive for History of Exact Sciences 78 (1):87-126.
    This paper concerns late 1920 s attempts to construct unitary theories of gravity and electromagnetism. A first attempt using a non-standard connection—with torsion and zero-curvature—was carried out by Albert Einstein in a number of publications that appeared between 1928 and 1931. In 1929, Tullio Levi-Civita discussed Einstein’s geometric structure and deduced a new system of differential equations in a Riemannian manifold endowed with what is nowadays known as Levi-Civita connection. He attained an important result: Maxwell’s electromagnetic equations and the gravitational (...)
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  3.  11
    Tables for the radii of the Sun, the Moon, and the shadow from John of Gmunden to Longomontanus.Bernard R. Goldstein & José Chabás - 2024 - Archive for History of Exact Sciences 78 (1):67-86.
    A table in five columns for the radii of the Sun, the Moon, and the shadow is included in sets of astronomical tables from the fifteenth to the early seventeenth century, specifically in those by John of Gmunden (d. 1442), Peurbach (d. 1461), the second edition of the Alfonsine Tables (1492), Copernicus (d. 1543), Brahe (d. 1601), and Longomontanus (d. 1647). The arrangement is the same and the entries did not change much, despite many innovations in astronomical theories in this (...)
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  4.  12
    Geographic longitude in Latin Europe during the twelfth and thirteenth centuries.C. Philipp E. Nothaft - 2024 - Archive for History of Exact Sciences 78 (1):29-65.
    This article surveys surviving evidence for the determination of geographic longitude in Latin Europe in the period between 1100 and 1300. Special consideration is given to the different types of sources that preserve longitude estimates as well as to the techniques that were used in establishing them. While the method of inferring longitude differences from eclipse times was evidently in use as early as the mid-twelfth century, it remains doubtful that it can account for most of the preserved longitudes. An (...)
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  5.  10
    Galois and the simple group of order 60.Ian Stewart - 2024 - Archive for History of Exact Sciences 78 (1):1-28.
    In his testamentary letter to Auguste Chevalier, Évariste Galois states that, in modern terminology, the smallest simple group has order 60. No proof of this statement survives in his papers, and it has been suggested that a proof would have been impossible using the methods available at the time. We argue that this assertion is unduly pessimistic. Moreover, one fragmentary document, dismissed as a triviality and misunderstood, looks suspiciously like cryptic notes related to this result. We give an elementary proof (...)
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