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Photographer's Note

Yesterday I show a castle in Olsztyn. Here the view of the corridor next to the courtyard.

At the end of this corridor there is a table made by Copernicus (see Workshop).

Nicolaus Copernicus was undoubtedly the most famous inhabitant of Olsztyn Castle (in the years 1516-19 and 1520-21). He was the administrator of the Warmia Chapter property. It is necessary to mention that the astronomer was responsible for the defence of Olsztyn against the attack of the Teutonic Knights, which took place in January 1521.

As historians assume, the experimental astronomical table was created at the turn of 1516 and 1517. Drawn by Nicolaus Copernicus on the wall of the cloister of Olsztyn castle, it was possible to graphically define the moment of the spring equinox. The appointment of this day made it possible to set the dates of movable church holidays, as well as to conduct research on the reform of the calendar. Among the observation instruments used by Copernicus, the table used to observe changes in the position of the Sun is distinguished by its innovation. It combines the functions of a kind of clock and a solar calendar.
The mechanism of operation of the board is the sum of the calculations and analysis of the lighting conditions of the cloister. The constructor of this tool used an innovative observation technique. The use of the projection of sunlight reflected from an object on the cloister window sill is the oldest known example of the so-called gnomonic reflection. The indicator of the current position of the Sun on the board was a spot formed by the light reflected from the horizontal mirror, which was located on the window sill of the third, from the north, window of the cloister. The plaque, 7.05 m long and 1.4 m wide, was made on the whitewash in the wet fresco technique. Diagonal calendar lines painted with red paint have been preserved on several pieces of plaster to this day. These lines correspond to the path marked on the wall by the image of the Sun reflected in the mirror on individual days - the table's accounting range covers the days between January 25 and April 24.

At the lower edge of the board, there are Arabic numerals painted in red paint, denoting the values ​​of the Sun's ecliptic length on selected days. The straight line corresponding to the vernal equinox is distinguished by the remnants of the preserved blue dye and the mysterious inscription "T I C" in capital letters. According to historians' assumptions, it may be a remnant of the inscription "Aeqinoctium" (Latin equinox). The arrangement of calendar lines is crossed out by a bunch of black hour lines, described in Roman numerals, converging downwards.

https://www.facebook.com/mit.olsztyn/videos/333488650948518/
https://visit.olsztyn.eu/article/1242/zobacz-film-o-tablicy-kopernika

See two Workshops.

holmertz, Silvio1953, pierrefonds, ChrisJ, COSTANTINO, mcmtanyel has marked this note useful

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Additional Photos by Malgorzata Kopczynska (emka) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 13579 W: 141 N: 35194] (158672)
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