Self-orienting armillary dial of the Professor Radovan Danić
Prof. Radovan Danić, PhD (1893-1979), an honorary lifetime President of the Astronomical Society Ruđer Bošković in Belgrade, owned a brass universal equinoctial ring sundial (98 mm in diameter), preserved by his descendants, who continued his work on popularizing astronomy through the activ...
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Serbian Geographical Society
2020-01-01
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Online Access: | http://www.doiserbia.nb.rs/img/doi/0350-3593/2020/0350-35932001073T.pdf |
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doaj-30cb1c153b144ddaa21f95a15dbe57ba2020-11-25T03:11:30ZengSerbian Geographical SocietyGlasnik Srpskog Geografskog Društva0350-35932406-078X2020-01-011001739210.2298/GSGD2001073T0350-35932001073TSelf-orienting armillary dial of the Professor Radovan DanićTadić Milutin0Prnjat Zorica1University of Belgrade, Faculty of Geography, SerbiaUniversity of Belgrade, Faculty of Geography, SerbiaProf. Radovan Danić, PhD (1893-1979), an honorary lifetime President of the Astronomical Society Ruđer Bošković in Belgrade, owned a brass universal equinoctial ring sundial (98 mm in diameter), preserved by his descendants, who continued his work on popularizing astronomy through the activities of the society. The sundial (ring dial) was measured, tested and compared to similar portable sundials (pocket sundials) exhibited in various European museums. In the classification scheme, along with the Parmenion’s and astronomical rings, it belongs to a group of pocket armillary sundials that do not require a compass. More precisely, it is a self-orienting armillary sundial whose rings are located under the circles of the celestial sphere of the same name at the moment of measurement. Therefore, when the apparent solar time is known, it turns into a solar compass. A corresponding sundial on the horizon to the self-orienting armillary sundial is the analemmatic sundial. The construction of a self-orienting armillary sundial was first described in the late 16th century by the English mathematician William Oughtred (1574-1660). In collaboration with the gnomonists from England and Austria, we determined where and when Professor Danić’s sundial was constructed: Vienna, second quarter of the 18th century. Originally, the sundial was adjusted for the latitude of Belgrade or Zemun (nowadays, a Belgrade municipality), which were under the Austrian rule for a long time during the 18th century. It is a beautiful, well-crafted, well-preserved, expensive sundial and astronomical instrument that should be kept in a museum, in the first place in the Museum of Astronomy of the Astronomical Observatory in Belgrade.http://www.doiserbia.nb.rs/img/doi/0350-3593/2020/0350-35932001073T.pdfportable sundialuniversal equinoctial ring dialarmillary sundialmathematical geography |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Tadić Milutin Prnjat Zorica |
spellingShingle |
Tadić Milutin Prnjat Zorica Self-orienting armillary dial of the Professor Radovan Danić Glasnik Srpskog Geografskog Društva portable sundial universal equinoctial ring dial armillary sundial mathematical geography |
author_facet |
Tadić Milutin Prnjat Zorica |
author_sort |
Tadić Milutin |
title |
Self-orienting armillary dial of the Professor Radovan Danić |
title_short |
Self-orienting armillary dial of the Professor Radovan Danić |
title_full |
Self-orienting armillary dial of the Professor Radovan Danić |
title_fullStr |
Self-orienting armillary dial of the Professor Radovan Danić |
title_full_unstemmed |
Self-orienting armillary dial of the Professor Radovan Danić |
title_sort |
self-orienting armillary dial of the professor radovan danić |
publisher |
Serbian Geographical Society |
series |
Glasnik Srpskog Geografskog Društva |
issn |
0350-3593 2406-078X |
publishDate |
2020-01-01 |
description |
Prof. Radovan Danić, PhD (1893-1979), an honorary lifetime President of the
Astronomical Society Ruđer Bošković in Belgrade, owned a brass universal
equinoctial ring sundial (98 mm in diameter), preserved by his descendants,
who continued his work on popularizing astronomy through the activities of
the society. The sundial (ring dial) was measured, tested and compared to
similar portable sundials (pocket sundials) exhibited in various European
museums. In the classification scheme, along with the Parmenion’s and
astronomical rings, it belongs to a group of pocket armillary sundials that
do not require a compass. More precisely, it is a self-orienting armillary
sundial whose rings are located under the circles of the celestial sphere of
the same name at the moment of measurement. Therefore, when the apparent
solar time is known, it turns into a solar compass. A corresponding sundial
on the horizon to the self-orienting armillary sundial is the analemmatic
sundial. The construction of a self-orienting armillary sundial was first
described in the late 16th century by the English mathematician William
Oughtred (1574-1660). In collaboration with the gnomonists from England and
Austria, we determined where and when Professor Danić’s sundial was
constructed: Vienna, second quarter of the 18th century. Originally, the
sundial was adjusted for the latitude of Belgrade or Zemun (nowadays, a
Belgrade municipality), which were under the Austrian rule for a long time
during the 18th century. It is a beautiful, well-crafted, well-preserved,
expensive sundial and astronomical instrument that should be kept in a
museum, in the first place in the Museum of Astronomy of the Astronomical
Observatory in Belgrade. |
topic |
portable sundial universal equinoctial ring dial armillary sundial mathematical geography |
url |
http://www.doiserbia.nb.rs/img/doi/0350-3593/2020/0350-35932001073T.pdf |
work_keys_str_mv |
AT tadicmilutin selforientingarmillarydialoftheprofessorradovandanic AT prnjatzorica selforientingarmillarydialoftheprofessorradovandanic |
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1724653852746055680 |