ObjI132-10
‹ Ancient Sundials
Dialface ID 130
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Abstract
Gibbs: A rectangular gnomon hole and related groove remain in the top surface of the dial. […] A trace of squarish leg is visible in the lower right front. A round mount hole is preserved in the bottom surface.
Measurements
Measurement record: pipeline ObjID 132, matched to this dialface by inventory number.
| Quality grade | B (completeness 96 %) |
|---|---|
| Dial surface | cone (decisive) · fit residual mm: cone 0.36, cylinder 1.19, sphere 4.30 |
| Latitude φ | 34.83 ± 0.86° (consensus of witnesses) |
| Klima | Rhodes (IV) |
| Engraved lines | 9 hour lines, 3 day lines |
| Cone half-angle α | 20.7 ± 0.12° (cone residual on all points 0.38 mm) |
| Measured | 2026-06-12 20:19 |
What the dial shows at this latitude
| Winter solstice | Equinox | Summer solstice | |
|---|---|---|---|
| Noon altitude of the Sun | 31.5° | 55.2° | 78.9° |
| Noon shadow (gnomon heights) | 1.63 | 0.70 | 0.20 |
| Length of the day | 9.6 h | 12.0 h | 14.4 h |
| Length of a seasonal hour | 48 min | 60 min | 72 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, figure 226-227, plate 542 (photograph).
- – Gibbs, Sharon L., Greek and Roman Sundials, New Haven and London, 1976, p. 250.
3D Models
