Sundials

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OROLOGIO DE SIDERALE
SUNDIAL FOR SIDEREAL TIME
 


Sundial for Sidereal Time (30 KB) Dial type : Wall sundial, vertical, flat, 370 x 350 cm
Declination of the wall : d = approximately 106° (west northwest)
Time display : see subsequent explanation.
Date information : Zodiac lines
Style : artistic
Gnomon : Horizontal gnomon with ball on the end.
Construction date : 1998
Designer : Righi Renzo, Corregio(RE)
Artistic design : Maria Luisa Montanari, Cogruzzo(RE)

Description :

The idea for this clock originated in 1994 as a result of the cooperation between Renzo Righi and the artist Maria Luisa Montanari.
The sundial in the extent of 370 X 350 cm at a vertical wall features two separated dials, each with a gnomon and the seven zodiac datelines.
They show the Temporary Hours (HORAE PLANITIAE) and the astronomical time rising and descending from the equinoxes at springtime. The descending sector is outlined by the curves of the maximal declination of the moon and characterized by the hour lines of the night produced by the moonlight. The sub division of the dial plate allows the half-yearly display of the solar and lunar eclipses of the years 2000 to 2020, visible in Italy. The path of the planet Saturn is shown between the different signs of the zodiac for the same time period.
Ritmo Siderico della Luna (24 KB) An artistic ornamentation is a serpent with a locket featuring the seven planets. To the left, Pegasus jumps out of the clock face. In his shade, the constellation of the Pegasus may be recognized, above it the full moon. Below there is a card with the sidereal rhythmus of the moon (RITMO SIDERICO della LUNA) and a small card with the crescent and the half moon. Finally, there is another sunflower on the right side below on the wall cornice.

This description is an extract from the booklet : "La meridiana nella storia" by Renzo Righi, March 2000.

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Last update : 26. December 2001