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Self-orienting armillary dial of the professor Radovan Danić

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2020
1037.pdf (1.008Mb)
Authors
Tadić, Milutin
Prnjat, Zorica
Article (Published version)
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Abstract
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.

Keywords:
Armillary sundial / Mathematical geography / Portable sundial / Universal equinoctial ring dial
Source:
Bulletin of the Serbian Geographical Society, 2020, 100, 1, 73-92
Publisher:
  • Srpsko geografsko društvo, Beograd

DOI: 10.2298/GSGD2001073T

ISSN: 0350-3593

Scopus: 2-s2.0-85090662596
[ Google Scholar ]
URI
https://gery.gef.bg.ac.rs/handle/123456789/1039
Collections
  • Radovi istraživača
Institution/Community
Geografski fakultet
TY  - JOUR
AU  - Tadić, Milutin
AU  - Prnjat, Zorica
PY  - 2020
UR  - https://gery.gef.bg.ac.rs/handle/123456789/1039
AB  - 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.
PB  - Srpsko geografsko društvo, Beograd
T2  - Bulletin of the Serbian Geographical Society
T1  - Self-orienting armillary dial of the professor Radovan Danić
VL  - 100
IS  - 1
SP  - 73
EP  - 92
DO  - 10.2298/GSGD2001073T
UR  - conv_1110
ER  - 
@article{
author = "Tadić, Milutin and Prnjat, Zorica",
year = "2020",
abstract = "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.",
publisher = "Srpsko geografsko društvo, Beograd",
journal = "Bulletin of the Serbian Geographical Society",
title = "Self-orienting armillary dial of the professor Radovan Danić",
volume = "100",
number = "1",
pages = "73-92",
doi = "10.2298/GSGD2001073T",
url = "conv_1110"
}
Tadić, M.,& Prnjat, Z.. (2020). Self-orienting armillary dial of the professor Radovan Danić. in Bulletin of the Serbian Geographical Society
Srpsko geografsko društvo, Beograd., 100(1), 73-92.
https://doi.org/10.2298/GSGD2001073T
conv_1110
Tadić M, Prnjat Z. Self-orienting armillary dial of the professor Radovan Danić. in Bulletin of the Serbian Geographical Society. 2020;100(1):73-92.
doi:10.2298/GSGD2001073T
conv_1110 .
Tadić, Milutin, Prnjat, Zorica, "Self-orienting armillary dial of the professor Radovan Danić" in Bulletin of the Serbian Geographical Society, 100, no. 1 (2020):73-92,
https://doi.org/10.2298/GSGD2001073T .,
conv_1110 .

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