ObjI135-11
‹ Ancient Sundials
Dialface ID 133
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Abstract
Two legs with a flat cyma recta profile flank the base. Gibbs: The gnomon hole in the top surface is 13 mm deep.
Measurements
Measurement record: pipeline ObjID 135, matched to this dialface by inventory number.
| Quality grade | B (completeness 25 %) |
|---|---|
| Dial surface | cone (decisive) · fit residual mm: cone 0.28, cylinder 2.53, sphere 3.01 |
| Latitude φ | 38.07 ± 0.26° (single witness: path-II-front-face) |
| Engraved lines | 11 hour lines, 0 day lines |
| Cone half-angle α | not applicable or not determined |
| Measured | 2026-06-12 21:29 |
What the dial shows at this latitude
| Winter solstice | Equinox | Summer solstice | |
|---|---|---|---|
| Noon altitude of the Sun | 28.2° | 51.9° | 75.6° |
| 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 223-224 (drawings with measurements), plate 544 (photograph).
- – Gibbs, Sharon L., Greek and Roman Sundials, New Haven and London, 1976, p. 252.
3D Models
