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 GeoAstro Applets |
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Horizontal, Equatorial, and Vertical Sundial
| Albrecht Dürer (1471-1528),
the famous
Renaissance painter, printmaker, engraver,
mathematician, and theorist, presented a drawing
with a detailed method for the construction of
sundials using compass and straightedge. He
published it
in 1525 in the third book of his
treatise
>Underweysung der messung, mit zirckel und
richtscheyt< (Teaching of Measuring). |
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Enter latitude
in decimal degrees, and press RETURN key. |
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Enter longitude in decimal degrees (eastern positive, western negative) and press RETURN key. |
| Use Shift key and click to move the center. |
| Setting the longitude
to zero the hour lines will indicate the local apparent
time (solar time). Taking into account the longitude the hour lines will indicate the standard time if the equation of time is added or subtracted. + = sundial
is fast on clock time
- = sundial is slow on clock time |
The sundial is using a polar gnomon (parallel to the Earth's axis).
Dürer's construction of the Archimedean
spiral
Testing the sundial at 51.62° N, 7.97° E on
May 12 at 14:05 CET
(equation of time 3:40 min, dial is fast)
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Albrecht Dürer (MacTutor History of Mathematics archive) Albrecht Dürer:
Underweysung der Messung, mit dem Zirckel und
Richtscheyt G.
Wolfschmidt: A Historian Looks at Astronomy in
the Classroom |
| Books |
| Albrecht
Dürer: Unterweisung der Messung mit dem Zirkel und
Richtscheit, Faksimile-Neudruck der Ausgabe
Nürnberg 1525, Verlag Dr. Alfons Uhl, Nördlingen
2000, ISBN 978 3 921503 17 1. |
Updated:
2023,
Oct 06
©
2011-2012 J. Giesen
