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. "Metamorphosis of a reflection sundial" by Riccardo Anselmi The article explains how to design a reflection sundial as a traditional plane sundial. 2. "Once upon a time there was the Trigono" by Baggio Francesco The author describes the construction of a reflection sundial on the vault of a house in the town of Baveno (VB). For its design a catoptric trigono has been created to simulate the alt-azimuth direction of a solar ray by means of a laser beam. The laser beam bouncing on the mirror can mark the position of the hour and day lines on any surface. 3. "Winter solstice: shortest day, early sunset, late sunrise" by De Donà Giuseppe In this article the author makes some considerations about the duration of the day and the sunrise and sunset times in the proximity of winter solstice. Investigation is carried out for three different latitudes representative of the northern, central and southern Italy. 4. "Exilles, 1760: the sundial of the gunner namesake of the King" by Formichetti Piervittorio On the Piedmont Alps, in the municipality of Exilles (TO), there is a sundial dated 1760 and signed Ambel. Despite being repeatedly repainted over time, no one worried about restoring its functionality nor identifying the author. Who was this person? His family benefited from the trust of Savoia King Charles Emmanuel III, with whom Ambel also shared his first name. 5. "Perspectiva horaria, sive de horographia gnomonica… Emmanuel Maignan's book" by Gunella Alessandro A brief presentation of the Latin work published in 1648 in Rome by the French physicist Emmanuel Maignan (1601-1676), theologist in the Minimi religious order. Alessandro Gunella translated four books from Latin to Italian for a total of more than 700 pages. Together with this issue we provide the first book in PDF format in the "Bonus" section of the site. The next three books will be published together with the future issues of the magazine. 6. "A spherical triangle graphically calculated, according to Clavius" by Gunella Alessandro As an example of the way Clavio worked, a step by step procedure is here presented, as he proposed in the book about the astrolabe, to graphically solve with the polar projection the problem of finding the sides and the angles of a spherical triangle where two sides and the angle between them are known. 7. "An interactive plane sundial on a U section bar" by Hoogenraad Han A horizontal sundial with a movable gnomon, to be appropriately positioned for time reading, is described. The way the clock works (based on the location of the hour plan) is then explained and different variants are described. 8. "An unusual sundial described by Adm. Fantoni" by Litta Giuseppe The author tells how he came into possession of an original document dated 1976 typed by Admiral Girolamo Fantoni where the famous gnomonist analyzes and explains the operation of a "double" sundial with Italian “da campanile” hours and astronomical hours. 9. "The globe dial of Prosymna: a new interpretation" by Pantanali Aurelio and Zorzenon Orlando The present treatise intends to provide a new hypothesis about the interpretation of the signs drawn on the south side of the Prosymna sphere and particularly the layout known as "herringbone". Instructions for tracing the lines with the help of a compass are also provided. 10. "Didactic experience in an elementary school" by Pedrocchi Piero The author tells how, in cooperation with the teacher, helped an elementary school class to build, decorate and correctly interpret a horizontal sundial. 11. "The globe dials of Prosymna and Matelica: is everything clear ?" by Editorial Board of "Orologi Solari" After a brief description of the way the two instruments work, an overview is taken of the various interpretations provided so far for the "herringbone" dial in the Prosymna sphere and for the latitude used in its design. 12. "Platonic and Archimedes solids for gnomonics together with a polyhedric scaphen (part 2)" by Savian Fabio Platonic and Archimedes solids are analyzed in order to put into evidence their geometric parameters with the purpose of designing multiple faces sundials and making a scaphen that can efficiently simulate a spherical surface by means of regular polygons. Truncated icosahedron is then used for the design of the horizontal scaphen that is made available in the paper sundials section of Sundial Atlas (www.sundialatlas.eu) with apps n. 41, 42 and 45. 13. "A new type of azimut sundial" by Zuccalà Giuseppe The article discusses a new type of azimuth sundial obtained by dividing the hour lines in two segments: the first segment with sun rays decreasing from summer to winter solstice, the second one with sun rays increasing from winter to summer solstice. In this way the figures that are obtained are similar to a kind of "analemma" and give an attractive shape to the picture. A digital bonus can also be downloaded for additional reference material. Hope you will enjoy the reading, although in Italian only. Ciao. Gian
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