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lars gislen

Lars Gislén

Retired, affiliated researcher

lars gislen

Analysis of the New Moon Times on the Disk of the Astronomical Clock in Gdansk, Poland.

Author

  • Lars Gislén
  • Wayne Orchiston

Summary, in English

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.

Department/s

  • Theoretical Particle Physics - Undergoing reorganization

Publishing year

2022

Language

English

Pages

75-82

Publication/Series

Journal of Astronomical History and Heritage

Volume

25

Issue

1

Document type

Journal article

Publisher

National Astronomical Research Institute of Thailand

Topic

  • Other Natural Sciences

Keywords

  • conjunction, calendar, astronomical clock

Status

Published

ISBN/ISSN/Other

  • ISSN: 1440-2807