ObjI463-5
‹ Ancient Sundials
Dialface ID 503
Abstract
Information on the Dialface ID 503 / Object ID 463
Measurements
Measurement record: pipeline ObjID 463, matched to this dialface by inventory number.
| Quality grade | B (completeness 73 %) |
|---|---|
| Dial surface | cone (decisive) · fit residual mm: cone 0.24, cylinder 0.67, sphere 3.16 |
| Latitude φ | 36.91 ± 0.41° (single witness: path-III-front-back) |
| Engraved lines | 3 hour lines, 3 day lines |
| Cone half-angle α | 30.9° (cone residual on all points 0.28 mm) |
| Measured | 2026-06-12 20:48 |
What the dial shows at this latitude
| Winter solstice | Equinox | Summer solstice | |
|---|---|---|---|
| Noon altitude of the Sun | 29.4° | 53.1° | 76.8° |
| Noon shadow (gnomon heights) | 1.78 | 0.75 | 0.23 |
| Length of the day | 9.4 h | 12.0 h | 14.6 h |
| Length of a seasonal hour | 47 min | 60 min | 73 min |
Computed for the measured latitude with the obliquity of the JPL ephemeris at 101 BC (year -100). The latitude is the one the dial was made for, not a find-spot coordinate.
References
- – Deonna, Waldemar, Le mobilier délien, Paris, 1938, p. 191.
- – Plassart, A., La synagogue juive de Délos, Paris, 1913, p. 201-215.
- – Winter, Eva, Zeitzeichen. Zur Entwicklung und Verwendung antiker Zeitmesser, Berlin and Boston, 2013, p. 347f.
- – Trümper, Monika, The Oldest Original Synagogue Building in the Diaspora, The Delos Synagogue Reconsidered, 2004
3D Models
