Article ID: CBB579278715

Longitudes, Syzygies, and Instruments in Regiomontanus’ Calendar for 1475–1531 (2024)

unapi

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.

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Authors & Contributors
Kremer, Richard L.
Shank, Michael H.
Anthony F. Aveni, William Saturno
Brummelen, Glen Van
Byrne, James Steven
Fischer, Gordon
Journals
Journal for the History of Astronomy
Marchand, Suzanne L.
Annalen der Physik
Arabica: Revue d'Études Arabes
Archive for History of Exact Sciences
Centaurus: International Magazine of the History of Mathematics, Science, and Technology
Publishers
Princeton University
Brill
CNRS
E. Rauner Verlag
Polistampa
Concepts
Astronomy
Calendars
Astrology
Instruments, astronomical
Alphonsine Tables
Copernicanism
People
Regiomontanus
Peurbach, Georg von
Bianchini, Giovanni
Copernicus, Nicolaus
Danti, Egnazio
Euler, Leonhard
Time Periods
15th century
16th century
Renaissance
Ancient
Medieval
Early modern
Places
Germany
Vienna (Austria)
Italy
Ottoman Empire
Rome (Italy)
China
Institutions
Universität Wien
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