Dear friends, a new issue of the Italian magazine Orologi Solari is available for download from the usual site http://www.orologisolari.eu/.
Here is the list of articles together with a short abstract: 1. - "The Scottish sundials seen by Thomas Ross in the late 19th century" by Francesco Caviglia The sundials of Scotland were presented by David MacGibbón and Thomas Ross in the fifth volume of their monumental work on architecture in Scotland from the 12th to the 18th century. The sundials are here presented according to the classification introduced by Ross for the more than 200 sundials listed, from simple dials on the wall, to very complex structures with many dials. 2. - "Conservative restoration of two sundials" by Giuseppe De Donà and Mauro Giongo The article describes the two dials on a church of Trentino (S. Maria Maddalena and S. Nicolò di Bari, in Palù del Fersina, TN) recently restored by the two authors. 3. - "The original sundials by Follador on the bell tower of Valdobbiadene Cathedral" by Giuseppe Flora An unpublished photo of the main square in Valdobbiadene (TV), taken in 1917 during a military parade, reveals interesting details about the two sundials that Giovanni Follador had made, respectively in 1840 and 1862, on the south facade of the Cathedral bell tower. 4. - "The restoration of an ancient sundial on the church of SS. Vito and Modesto in Spinea (VE)" by Giuseppe Flora The restoration of an ancient sundial on the church of SS. Vito e Modesto in Spinea (VE) brings out interesting curiosities about the orientation of churches in the Venetian. 5. - "Sundials on cylindrical surfaces, according to Schoener" by Alessandro Gunella The author illustrates the theoretical premises that Schoener used in the construction of sundial on a vertical cylindrical surface. He is perhaps the only one to propose a general theory of the problem. 6. - "The reconstruction of an old sundial through the Involution" by Alessandro Gunella The author shows how to draw the missing hour lines of an old sundial, having at least three of them available, using the relationship that binds the quaternes of points and lines of a sundial: the harmonic cross-ratio or Involution. 7. - "Longitude - Dissertation on the most famous geographical angle" by Michele T. Mazzucato The author presents a historical excursus on methods for the determination of geographical longitude: the method of eclipses and lunar distances, the method of the Jovian moons and finally the chronometric method, recalling its theoretical formulation, towards the middle of the '500 without suitable clocks, and its practical application, towards the middle of the '700 after the realization of precise chronometers by John Harrison. 8. - "An evolved ring of Hipparchus" by Mario Sommaruga and Nicola Scarpel The authors have created an interesting astronomical instrument that can be considered an evolution of the ring of Hipparchus; it generates suggestive configurations of shadows and can be very useful for educational purposes. 9. - "An Excel sheet for a useful coordinate transformation (Short Contribution)" by Francesco Caviglia How to transform orthogonal coordinates of points into distances from two footholds (and vice versa) to easily draw them on a wall. 10. - "A graphic play for those who do not have computers (Short Contribution)" by Alessandro Gunella The author adds a new variant to a graphic MODULO, already treated, which facilitates the design of a sundial on a declining vertical surface. The new variant is to be used only on no-declining surfaces. Hope you will enjoy the reading, although in Italian only. Ciao ! Gian
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