ObjI130-15
‹ Ancient Sundials
Dialface ID 128
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Abstract
A slightly visible engraved line sets of the limbus of this sundial. Two broad and low legs with a cyma recta profile flank the base. Gibbs: The base of a bronze gnomon in lead fill remains in the top of the dial above the meridian.
Measurements
Measurement record: pipeline ObjID 130, matched to this dialface by inventory number.
This object is registered in the measurement database, but its own record holds no measured values; see the variants below.
Variant Frag1
| Quality grade | B (completeness 100 %) |
|---|---|
| Dial surface | cone (decisive) · fit residual mm: cone 0.30, cylinder 2.83, sphere 3.58 |
| Latitude φ | 38.00 ± 1.14° (consensus of witnesses) |
| Klima | Athens, Delos, Rhodes (IV) |
| Engraved lines | 11 hour lines, 3 day lines |
| Cone half-angle α | 30.8 ± 0.10° (cone residual on all points 0.32 mm) |
| Measured | 2026-06-12 20:18 |
What the dial shows at this latitude
| Winter solstice | Equinox | Summer solstice | |
|---|---|---|---|
| Noon altitude of the Sun | 28.3° | 52.0° | 75.7° |
| Noon shadow (gnomon heights) | 1.86 | 0.78 | 0.26 |
| Length of the day | 9.3 h | 12.0 h | 14.7 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. 190 f, figures 218 and 219 (drawings), plate 538 (photograph).
- – Gibbs, Sharon L., Greek and Roman Sundials, New Haven and London, 1976, p. 248.
3D Models
