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Changing the Angle of Vision: Astrolabe Dials on Astronomical Clocks

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From the middle of the fourteenth century until the Early Modern period, several monumental astronomical clocks were erected in Europe, and on many of them astrolabe dials were placed. On a group of earlier clocks, “southern astrolabes” (i.e. with stereographic projection from the North Pole) were employed, whereas later examples show a “northern astrolabe” (i.e., a stereographic projection from the South Pole), which is commonly used on portable astrolabes. The material and textual evidence as well as reasons for this change shall be examined. Moreover, the question of transmission of special variants of stereographic projection from East to West will be discussed.

Affiliations: 1: Institute for Philosophy, History of Literature, Science and Technique, Technische Universität Berlin Straße des 17. Juni 135, 10623 BerlinGermany oestmann@nord-com.net

10.1163/15700674-12342253
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/content/journals/10.1163/15700674-12342253
2017-09-22
2017-10-24

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