A GERMAN BRASS ASTROLOGICAL DISC WITH LEATHER CASE Signed and dated 'GEORGIVS HARTMAN NORENBERGE FACIEBAT 1541.' This large brass disc is inscribed on one side only. All the letters and numbers are punched with Hartman's characteristic tools. Around the rim is a scale of twnety-four hours, divided to quarter-hour intervals. MITTAG is at the top, and the hours to the right (in roman numerals) run to MITTER NACHT at the bottom, and then back to the top, the hours in Arabic numerals. Labelled at the right 'STVND NACH MITTAG', and to the left 'STVND VOR MITTAG'. Centred on the vertical and below the horizontal diameter of the plate are twenty-four arcs representing planetary, or unequal, hours. With the same centre is a circle divided into the months of the year and the months into single days. At the very centre is a small circle marked with twenty-four hours in Arabic numerals. Within the month circle, and within the arcs, are the planetary symbols of the Governors of the Planetary Hours. A planetary hour is a twelfth of the time between sunrise and sunset in the case of day hours, and between sunset and sunrise in the case of night hours. These hours are assigned to the seven planets in Ptolemaic order, as given in the table in the upper central part of this disc. With seven planets and twenty-four hours, the first hour of the day gives the planet's name to the whole day, and hence the present day names for the days of the week. At the top of the disc is an extension in the form of three roundels, the upper most bearing the signature. There is a hole for a suspension ring or cord. The back of the disc is plain. Some old writing in red ink reads 'Instrumentum indicans horas planetarum aereum solidum Normbergae 1541 St. 6 H 3'. A finely made draw-string, fitted case is made of wood covered with black leather that is fully blind-tooled with a foliate pattern and three armorial shields. One bears the date 1541. The cord is green, and appears to be original. In association is a disc of paper printed from an engraved plate on one side. It has degree and hour scales, azimuths, almucantars and Houses. The appearance of the letters and numbers is not contemporary with Hatman's disc, and suggests the early seventeenth Century. 10 in. (27.5 cm.) diam.; the case 12 in. (30.5 cm.) diam.
A GERMAN BRASS ASTROLOGICAL DISC WITH LEATHER CASE Signed and dated 'GEORGIVS HARTMAN NORENBERGE FACIEBAT 1541.' This large brass disc is inscribed on one side only. All the letters and numbers are punched with Hartman's characteristic tools. Around the rim is a scale of twnety-four hours, divided to quarter-hour intervals. MITTAG is at the top, and the hours to the right (in roman numerals) run to MITTER NACHT at the bottom, and then back to the top, the hours in Arabic numerals. Labelled at the right 'STVND NACH MITTAG', and to the left 'STVND VOR MITTAG'. Centred on the vertical and below the horizontal diameter of the plate are twenty-four arcs representing planetary, or unequal, hours. With the same centre is a circle divided into the months of the year and the months into single days. At the very centre is a small circle marked with twenty-four hours in Arabic numerals. Within the month circle, and within the arcs, are the planetary symbols of the Governors of the Planetary Hours. A planetary hour is a twelfth of the time between sunrise and sunset in the case of day hours, and between sunset and sunrise in the case of night hours. These hours are assigned to the seven planets in Ptolemaic order, as given in the table in the upper central part of this disc. With seven planets and twenty-four hours, the first hour of the day gives the planet's name to the whole day, and hence the present day names for the days of the week. At the top of the disc is an extension in the form of three roundels, the upper most bearing the signature. There is a hole for a suspension ring or cord. The back of the disc is plain. Some old writing in red ink reads 'Instrumentum indicans horas planetarum aereum solidum Normbergae 1541 St. 6 H 3'. A finely made draw-string, fitted case is made of wood covered with black leather that is fully blind-tooled with a foliate pattern and three armorial shields. One bears the date 1541. The cord is green, and appears to be original. In association is a disc of paper printed from an engraved plate on one side. It has degree and hour scales, azimuths, almucantars and Houses. The appearance of the letters and numbers is not contemporary with Hatman's disc, and suggests the early seventeenth Century. 10 in. (27.5 cm.) diam.; the case 12 in. (30.5 cm.) diam.
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
