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Sundial at Italic hours
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Cooke and Sons astrograph
Cook and Sons astrograph
Cooke and Sons photographic camera
Thornton Pickard photographic camera
Cavignato chronograph
Fuess chronograph
Barraud marine chronometer
Two cell photometer
One cell photometer
Stellar interferometer
Sundial at Babylonian hours
Sundial at Italic hours
Micrometro
Grubb wire micrometer
Pendulum A. Kittel
Pendulum Cavignato and Mioni
Kobell pendulum
Riefler pendulum
Pendulum Riefler and Secchi
Browning prism spectroscope
Browning prism spectroscope
Instrument of the Repsold and Soehne passages
Zenithal telescope
Cooke and Sons refractor telescope
Salmoiraghi refractor telescope

Sundial at Italic hours

Anonymous

Displayed in:

Astronomical Observatory of Abruzzo

Astronomical Observatory of Abruzzo

Via Mentore Maggini, Teramo

Closed today: open tomorrow at 09:00

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The vertical sundial in true solar time is made up of a marble slab (white Carrara) on which the reference marks and the hours are engraved. The clock with Italic hours is located on the wall facing exactly south-west of the central building of the Observatory. The clock indicates how many hours have passed since sunset the previous evening (horae ab occasionu Solis). This system of counting the hours has spread throughout the Mediterranean basin since the 11th century AD, with the penetration of Arab culture in Europe. This system was the only one in use in Italy until almost the whole of the last century: hence the name "Italic". A brass rod called "orthostyle" is fixed perpendicularly to the marble slab. The rod generates a line of shadow in the light of the sun, the extreme point of which provides these indications: the hours elapsed since the sunset of the previous evening, the seasons, true solar noon and duration of the diurnal arc.
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Title: Sundial at Italic hours

Author: Anonymous

Date: 1890

Technique:

Displayed in: Astronomical Observatory of Abruzzo

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