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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 Babylonian hours

Anonymous

Displayed in:

Astronomical Observatory of Abruzzo

Astronomical Observatory of Abruzzo

Via Mentore Maggini, Teramo

Closed now: open 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 Babylonian hour clock is located on the east facing wall of the central building of the Observatory. The clock indicates how many hours the Sun has risen (horae ab ortu Solis). This system of counting the hours has been in use throughout the Middle East until a few decades ago and its origin dates back to ancient times. A brass rod called an orthostyle is fixed perpendicularly to a certain point on the marble slab. The rod generates a line of shadow in the sunlight, the extreme point of which is the useful element for reading this watch. The extremity of the shadow of the orthostyle, running over the engraved lines, provides these indications: the hours elapsed since sunrise and the seasons.
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Details

Title: Sundial at Babylonian hours

Author: Anonymous

Date: 1890

Technique:

Displayed in: Astronomical Observatory of Abruzzo

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