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 conical sundials of Antiquity. Generalities - Part I" by Albéri
Auber Paolo
In this first part the author describes conical sundials as they were
conceived and built in antiquity; he then analyzes the effect of an
incorrect evaluation of the latitude of the place and he finally describes
the practical process followed for their realization. In the second part
the author proposes an innovative formula that allows us to derive the
project latitude ("intended") following exclusively linear measurements
made on the sundial, together with a well-known formula that provides the
half-width of the cone.
2. "Roman inscripted stones and sundials – Updates (2nd part)" by Enrico
del Favero
After the three Roman inscribed stones presented in the first part (two in
the province of Belluno and one in Pompei), three more are described in
this second part: a second "special" stone still in Pompeii, one in
Pignataro Interamna in the province of Frosinone and one in Sorrento near
Naples.
3. "Petrus Apianus and the Torquetum" by Alessandro Gunella
The author presents his translation (offered as a Bonus) of an excerpt from
the book "Astronmicum Caesareum" by Petrus Apianus, dedicated to the
description of the construction and use of Torquetum: an astronomical
instrument to detect and convert measurements made in the three coordinate
systems: horizontal, equatorial and ecliptic.
4. "The Nuremberg Ab Ortu sundial" by Alessandro Gunella
The time system in use at the time of the Renaissance in the city of
Nuremberg (a sort of mixed "ab ortu" and "ab occasu" systems, with variable
duration of hours) is presented based on what was written in a
sixteenth-century book by Andreas Schöner.
5. "Three methods by Andrea Schöner to draw a horizontal sundial and
extension to the declining sundial" by Alessandro Gunella
The three different modalities presented by Andrea Schöner in his book
"Gnomonice", from 1562, to trace the hour lines of a horizontal sundial,
are discussed, the third of them absolutely unknown and never treated by
any other author. An extension of this third method to sundials on
declining vertical planes is then formulated together with some
considerations which justify their constructive logic.
6. "Mario Tebenghi, gnomonist of other times, about his life and creations"
by Giorgio Mesturini, Guido Tonello
Cav. Mario Tebenghi is remembered in this article by two of his friends who
were also his collaborators for some gnomonic realizations: a tribute to a
very prolific Piedmontese artist who contributed so much to the development
and modern renaissance of gnomonics and an opportunity to better know his
personality and his works.
7. "The digital Bonuses of the first 20 numbers of Orologi Solari" by
Editorial board
We present the index, supplied in Excel format, of the attachments (digital
Bonuses) offered with the first 20 issues of the Orologi Solari magazine
and we review some examples of Bonuses that seem to be among the most
interesting and useful.
8. "A reflection sundial in the Convent of the Capuchin Friars of
Monterotondo (Rome)" by Nicola Severino
The beautiful reflection sundial from the seventeenth-eighteenth century in
the sacristy of the convent of the Capuchin friars in Monterotondo, near
Rome (surveyed in the Sundial Atlas as IT7049) is described in detail, on
the basis of an inspection and of the few information found.
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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