File:Dreiteilige Sonnenuhr, Deutsches Museum.jpg
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English: Three-part sundial showing azimuth and elevation.
All three dials indicate the azimuth and altitude of the sun or moon. The measure the hour angle. The inclination of the middle sundial is the same as the latitude of the Museum (48° 7' 50"). It is therefore a polar sundial, with its surface parallel to the earth's axis. The vertical and inclined sundials illustrate the typical shapes of the white curves. The horizon line (altitude 0) is a straight line. With increasing altitude we obtain a set of hyperbolas with increasing curvature. When the altitude is exactly equal to the inclination of the sundial, the curve is a parabola. For higher altitudes the curves are ellipses; in the special case of a horizontal dial they are all circles.Deutsch: Dreiteilige Sonnenuhr zur Anzeige von Azimut und Höhe. Inv.-Nr. 98/11. Berechnung und Gestaltung: Y. Opizzo, Ch. Tobin, 1997.
Alle drei Uhren zeigen das Azimut und die Höhe der Sonne oder des Mondes über dem Horizont an. Sie messen dafür den Stundenwinkel. In der Mitte befindet sich eine polare Uhr, deren Fläche parallel zur Erdachse angeordnet ist. Ihre Neigung entspricht der örtlichen Breite von 48°7'50". Bei der geneigten und der senkrechten Uhr verändern die weißen Kurven gleicher Höhe ihre Form in typischer Weis. Die Horizontlinie (Höhenwinkel = 0°) ist eine Gerade. Mit zunehmender Höhe entsteht eine Folge von Hyperbeln mit wachsender Krümmung. Ist der Höhenwinkel gleich der Neigung der Uhrenplatte, so entsteht eine Parabel. Darüber entstehen Ellipsen, die bei der waagerechten Ausführung in Kreise übergehen. |
| Date | |
| Source | Own work |
| Author | Till Niermann |
| Camera location |  | View this and other nearby images on: OpenStreetMap |  |
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. |
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| current | 19:59, 27 July 2019 | | 2,448 × 3,264 (3.49 MB) | Till.niermann (talk | contribs) | {{Information |description ={{en|1=Three-part sundial showing azimuth and elevation. All three dials indicate the azimuth and altitude of the sun or moon. The measure the hour angle. The inclination of the middle sundial is the same as the latitude of the Museum (48° 7' 50"). It is therefore a polar sundial, with its surface parallel to the earth's axis. The vertical and inclined sundials illustrate the typical shapes of the white curves. The horizon line (altitude 0) is a straight line. Wi... |
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