ObjID62-1
‹ Ancient Sundials
Dialface ID 59
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Abstract
The large base is decorated with four steps, as well as with panels outlined with a narrow molding. A four-petalled flower can be seen in the center of both left and right sides.
Measurements
Measurement record: pipeline ObjID 62, matched to this dialface by inventory number.
| Quality grade | A (completeness 66 %) |
|---|---|
| Dial surface | cone (preferred, not decisive) · fit residual mm: cone 1.47, cylinder 1.47, sphere 2.47 |
| Latitude φ | 30.13 ± 0.03° (consensus of witnesses) |
| Klima | nearest Alexandria (26.6 sigma) |
| Engraved lines | 10 hour lines, 2 day lines |
| Cone half-angle α | 24.0 ± 0.23° (cone residual on all points 1.54 mm) |
| Measured | 2026-06-12 21:01 |
What the dial shows at this latitude
| Winter solstice | Equinox | Summer solstice | |
|---|---|---|---|
| Noon altitude of the Sun | 36.2° | 59.9° | 83.6° |
| Noon shadow (gnomon heights) | 1.37 | 0.58 | 0.11 |
| Length of the day | 10.0 h | 12.0 h | 14.0 h |
| Length of a seasonal hour | 50 min | 60 min | 70 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
- – Gibbs, Sharon L., Greek and Roman Sundials, New Haven and London, 1976, p. 173, p. 176, plate 11.
- – Héron de Villefosse, Antoine Marie, Musée Africain du Louvre: promenades archéologiques en Algérie et en Tunisie, Paris, 1921, p. 19, no. 254.
- – Guerbabi, Ali, Les cadrans solaires antiques d’Algérie, 2017, no. 8.
- – Cherbonneau, Auguste, Inscriptions latines découvertes dans la province de Constantine, depuis le commencement de l'année 1860, 1860-1861, p. 147, no. 17.
- – Berbrugger, A., Épigraphie numidique, 1864, p. 192, no. 52.
3D Models
