Results 61 to 70 of about 292,551 (95)

The Greek portable sundial from Memphis rediscovered

Journal for the History of Astronomy, 2021
Experts studying antique astronomic instruments are well aware of a small class of so-called portable sundials from the Roman Empire. Over the past few decades, they have been considered in several important publications, including a recent book by Richard J. A. Talbert, in which he systematized the available information. Talbert and earlier J.
exaly   +2 more sources

Gears from the Byzantines: A portable sundial with calendrical gearing

Annals of Science, 1985
Summary The Science Museum, London, has recently acquired four fragments of a portable sundial with associated calendrical gearing. All the fragments are made of low zinc brass of substantially the same composition. The sundial is of a type known in other examples, some the products of recent archaeological excavations and all dated to the Late Antique
J.V. Field, M.T. Wright
exaly   +2 more sources

The ancient portable sundial of Choma

Journal for the History of Astronomy
A new type of portable ancient sundial was discovered during excavations in Turkey in 2011, at the ancient city of Choma. Designed to function at the latitude of Alexandria, it is a small-sized instrument that still retains its fixed gnomon. In addition to a previously unseen geometric layout for an unequal-hour sundial, the hour lines are numbered ...
Ünal Demirer, Denis Savoie
exaly   +2 more sources

A Portable Sundial from Byzantine Apollonia-Arsuf / Sozousa?

Semitica Et Classica, 2009
This article examines a unique clay object that came from the site of Apollonia-Arsuf (Israel), which we tend to consider was used as a horizontal (flat) portable sundial (horologium). The object is somewhat pentagonal in shape, depicting a design that was incised (and partially stamped) on it prior to firing.
exaly   +2 more sources

Sundial

Campus gathering at the sundial in front of Penn ...
Romito, David
exaly   +6 more sources

ON A SINGULAR CHINESE PORTABLE SUNDIAL *

Nuncius, 1986
Abstract title RIASSUNTO /title La produzione di orologi solari portatili orizzontali e verticali risale in Cina presumibilmente al XVII-XVIII secolo a seguito della diffusione degli orologi di produzione europea.
GIULIANO BERTUCCIOLI, EDOARDO PROVERBIO
openaire   +1 more source

Greek and Roman Portable Sundials An Ancient Essay in Approximation

Archive for History of Exact Sciences, 2000
The author reports about nine portable sundials that have survived from Antiquity. These devices show the usual subdivision of the time from sunrise to sunset into twelve equal hours. (In contrast to the modern 24 equal hours from midnight to midnight.) Fixed sundials work exactly in principle, but the portable ones show the time only approximately ...
openaire   +1 more source

An Ancient Rule for Making Portable Altitude Sundials from an ‘Unedited’ Medieval Text of the Tenth Century

Journal for the History of Astronomy, 2011
The use of altitude dials that worked on the same principle as the cylinder for travellers may be proved for Christian Europe between the tenth and eleventh centuries by the 'Canterbury Pendant': a little portable sundial made of silver and gold found in 1938, during the work of ground levelling of the cemetery inside the cloister of the cathedral of ...
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Rezension zu: J.A. Talbert, Roman Portable Sundials : the Empire in Your Hand, Oxford, 2017

2019
Zweitveröffentlichung
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A portable sundial designed by Ahmed Muhtar Pasha and his treatise accounting for its usage

2009
Either horizontal or vertical, sundials were of common use in the Ottoman Empire. Set on the south western façade of the mosques, the vertical sundials were especially used to determine the prayer times. Although the introduction of the mechanical clocks in the Empire in the 17th century threathened the popularity of sundials, their usage seem to have ...
BİR, Atilla, GÜNERGUN, Feza
openaire   +1 more source