Analysis of the New Moon Times on the Disk of the Astronomical Clock in Gdansk, Poland.
(2022) In Journal of Astronomical History and Heritage 25(1). p.75-82- Abstract
- The calendar disk of the fifteenth century astronomical clock in the church of Saint Mary in Gdansk (Poland) contains a wealth of astronomical and calendrical data. We make a statistical analysis of the mean conjunction times of all the mean New Moons as represented on the disk for four Metonic 19-year cycles. We find that the conjunction times were generated using the Alfonsine value for the length of the synodic month and with a mean longitude correction from the Alfonsine meridian (Toledo in Spain) by 1 hour and 16 minutes. This indicates a location with a longitude of a little more than 19° east of Toledo but due to the uncertainty of the actual locations in longitude at the time it is not possible to point out a specific location. The... (More)
- The calendar disk of the fifteenth century astronomical clock in the church of Saint Mary in Gdansk (Poland) contains a wealth of astronomical and calendrical data. We make a statistical analysis of the mean conjunction times of all the mean New Moons as represented on the disk for four Metonic 19-year cycles. We find that the conjunction times were generated using the Alfonsine value for the length of the synodic month and with a mean longitude correction from the Alfonsine meridian (Toledo in Spain) by 1 hour and 16 minutes. This indicates a location with a longitude of a little more than 19° east of Toledo but due to the uncertainty of the actual locations in longitude at the time it is not possible to point out a specific location. The method of calculating the conjunction times differs from other contemporary calendars and has considerably less quality than other contemporary conjunction lists. (Less)
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- author
- Gislén, Lars LU and Orchiston, Wayne
- organization
- publishing date
- 2022
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- conjunction, calendar, astronomical clock
- in
- Journal of Astronomical History and Heritage
- volume
- 25
- issue
- 1
- pages
- 75 - 82
- publisher
- National Astronomical Research Institute of Thailand
- ISSN
- 1440-2807
- language
- English
- LU publication?
- yes
- id
- 8b353b41-19bd-4bcd-a037-c5560aaad26a
- date added to LUP
- 2022-06-21 03:04:28
- date last changed
- 2022-06-21 11:04:02
@article{8b353b41-19bd-4bcd-a037-c5560aaad26a, abstract = {{The calendar disk of the fifteenth century astronomical clock in the church of Saint Mary in Gdansk (Poland) contains a wealth of astronomical and calendrical data. We make a statistical analysis of the mean conjunction times of all the mean New Moons as represented on the disk for four Metonic 19-year cycles. We find that the conjunction times were generated using the Alfonsine value for the length of the synodic month and with a mean longitude correction from the Alfonsine meridian (Toledo in Spain) by 1 hour and 16 minutes. This indicates a location with a longitude of a little more than 19° east of Toledo but due to the uncertainty of the actual locations in longitude at the time it is not possible to point out a specific location. The method of calculating the conjunction times differs from other contemporary calendars and has considerably less quality than other contemporary conjunction lists.}}, author = {{Gislén, Lars and Orchiston, Wayne}}, issn = {{1440-2807}}, keywords = {{conjunction, calendar, astronomical clock}}, language = {{eng}}, number = {{1}}, pages = {{75--82}}, publisher = {{National Astronomical Research Institute of Thailand}}, series = {{Journal of Astronomical History and Heritage}}, title = {{Analysis of the New Moon Times on the Disk of the Astronomical Clock in Gdansk, Poland.}}, url = {{https://lup.lub.lu.se/search/files/120417616/2022JAHH...25...75G.pdf}}, volume = {{25}}, year = {{2022}}, }