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.
| Original language | English |
|---|---|
| Pages (from-to) | 75-82 |
| Journal | Journal of Astronomical History and Heritage |
| Volume | 25 |
| Issue number | 1 |
| Publication status | Published - 2022 |
Subject classification (UKÄ)
- Other Natural Sciences