Quadrant Dial
| This quadrant
is a portable altitude sundial for a single latitude. The instrument is equipped with a simple Sun sight on one edge. A weighted thread with a sliding bead is hanging from the apex. |
See
instructions for interactive use below
   |
Enter the latitude (decimal degrees) into the
text field and hit Return key. The latitude is indicated in the lower right. |
 |
The interactive
regions (light gray scales) are changing the cursor to cross hair. |
 |
Click into the
light gray date
scale to set
the bead. Upper scale: Dec 21 - Jun 21, or lower: Jun 21 - Dec 21. |
 |
Click into the
degree scale (light gray) on the limb to direct the sight to the Sun. |
 |
Use the
"Today"
button to set the bead to the current date. |
| Books |
| Morrison, James
E.: The Astrolabe, Janus. Softcover edition, 2007, Rehobot Beach, DE USA, ISBN-10: 0939320304, ISBN-13: 978-0939320301. Details... Hügin, Johannes: Das Astrolabium und die Uhr, Ulm, 1978, ISBN 3-921348-23-4. Rohr, René R. J.: Die Sonnenuhr. Geschichte, Theorie, Funktion. Callwey, München 1982. Meyer, Jörg: Die Sonnenuhr und ihre Theorie. Harry Deutsch, Frankfurt 2008. Zenkert, Arnold: Faszination Sonnenuhe (mit CD-ROM), Harry Deutsch, Frankfurt 2000. |
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Quadrant
Sundial (PostScript file by Valentin Hristov) Gunter's
Quadrant (J. E.
Morrison, PDF) Edmund Gunter biography (MacTutor History of Mathematics archive) Gunter's
quadrant (Navigation Museum) Gunter quadrant (The Whipple Museum) A Gunter
quadrant and practical knowledge (The Whipple Museum) Gunter quadrant (National Maritime Museum) The Electric Astrolabe
(J. E. Morrison) Astrolabium
(Deutsches Museum) Der
Gunter-Quadrant (Gunter W.) Das
Astrolab (Informatik Uni Erlangen) |
©
2009 J. Giesen
