Longitudes, Syzygies, and Instruments in Regiomontanus' Calender for 1475-1531
(2024) In Journal of Astronomical History and Heritage 27(1). p.91-104- Abstract
- Instruments and tables in Regiomontanus’ calendar published in 1474 are analysed and explained. It is shown that Regiomontanus used the Alfonsine Tables corrected for the longitude time difference between Toledo and Nuremberg. It is also shown that for the syzygy and eclipse times he used apparent solar times. The syzygy tables of George Peurbach may have been used to correct from mean to true syzygies. The calendar also contains an instrument for converting between equal and unequal times, a volvelle for finding the true longitude of the Moon, a quadrant tool for the construction of a horizontal sundial, and a universal vertical sundial. The construction and workings of these instruments are analysed.
Instruments and tables in... (More) - Instruments and tables in Regiomontanus’ calendar published in 1474 are analysed and explained. It is shown that Regiomontanus used the Alfonsine Tables corrected for the longitude time difference between Toledo and Nuremberg. It is also shown that for the syzygy and eclipse times he used apparent solar times. The syzygy tables of George Peurbach may have been used to correct from mean to true syzygies. The calendar also contains an instrument for converting between equal and unequal times, a volvelle for finding the true longitude of the Moon, a quadrant tool for the construction of a horizontal sundial, and a universal vertical sundial. The construction and workings of these instruments are analysed.
Instruments and tables in Regiomontanus’ calendar published in 1474 are analysed and explained. It is shown that Regiomontanus used the Alfonsine Tables corrected for the longitude time difference between Toledo and Nuremberg. It is also shown that for the syzygy and eclipse times he used apparent solar times. The syzygy tables of George Peurbach may have been used to correct from mean to true syzygies. The calendar also contains an instrument for converting between equal and unequal times, a volvelle for finding the true longitude of the Moon, a quadrant tool for the construction of a horizontal sundial, and a universal vertical sundial. The construction and workings of these instruments are analysed. (Less)
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- author
- Gislén, Lars LU
- organization
- publishing date
- 2024
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Astronomical History and Heritage
- volume
- 27
- issue
- 1
- pages
- 14 pages
- publisher
- National Astronomical Research Institute of Thailand
- external identifiers
-
- scopus:85189565416
- ISSN
- 1440-2807
- DOI
- 10.3724/SP.J.1440-2807.2024.01.07
- language
- English
- LU publication?
- yes
- id
- efaca5ac-9955-4562-9175-2b53922d2cd9
- date added to LUP
- 2024-04-02 09:18:10
- date last changed
- 2024-04-23 13:29:59
@article{efaca5ac-9955-4562-9175-2b53922d2cd9,
abstract = {{Instruments and tables in Regiomontanus’ calendar published in 1474 are analysed and explained. It is shown that Regiomontanus used the Alfonsine Tables corrected for the longitude time difference between Toledo and Nuremberg. It is also shown that for the syzygy and eclipse times he used apparent solar times. The syzygy tables of George Peurbach may have been used to correct from mean to true syzygies. The calendar also contains an instrument for converting between equal and unequal times, a volvelle for finding the true longitude of the Moon, a quadrant tool for the construction of a horizontal sundial, and a universal vertical sundial. The construction and workings of these instruments are analysed.<br/><br/>Instruments and tables in Regiomontanus’ calendar published in 1474 are analysed and explained. It is shown that Regiomontanus used the Alfonsine Tables corrected for the longitude time difference between Toledo and Nuremberg. It is also shown that for the syzygy and eclipse times he used apparent solar times. The syzygy tables of George Peurbach may have been used to correct from mean to true syzygies. The calendar also contains an instrument for converting between equal and unequal times, a volvelle for finding the true longitude of the Moon, a quadrant tool for the construction of a horizontal sundial, and a universal vertical sundial. The construction and workings of these instruments are analysed.}},
author = {{Gislén, Lars}},
issn = {{1440-2807}},
language = {{eng}},
number = {{1}},
pages = {{91--104}},
publisher = {{National Astronomical Research Institute of Thailand}},
series = {{Journal of Astronomical History and Heritage}},
title = {{Longitudes, Syzygies, and Instruments in Regiomontanus' Calender for 1475-1531}},
url = {{http://dx.doi.org/10.3724/SP.J.1440-2807.2024.01.07}},
doi = {{10.3724/SP.J.1440-2807.2024.01.07}},
volume = {{27}},
year = {{2024}},
}