ObjID112-1
‹ Ancient Sundials
Dialface ID 109
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Abstract
Gibbs: A lead shell remains in this 31 mm long edge-shaped gnomon hole. Ten hour lines are preserved on this small, worn example (2, 3, 4, 5, 6, 7, 8, 9, 10, 1). All hour lines extend beyond a winter solstice which is parallel to the engraved equinox and the lower edge. Day curves appear to be less deeply engraved than hour lines. Two stylized legs flank the base. Schaldach: 9 Stundenlinien (2-11). Im v-förmigen Gnomonkanal von 31 mm Länge und etwa 10 mm Tiefe sind noch Reste des Bleimantels vorhanden.
Measurements
Measurement record: pipeline ObjID 112, matched to this dialface by inventory number.
| Quality grade | B (completeness 79 %) |
|---|---|
| Dial surface | cone (decisive) · fit residual mm: cone 0.50, cylinder 8.57, sphere 3.38 |
| Latitude φ | 38.93 ± 5.24° (consensus of witnesses) |
| Klima | Athens, Delos, Hellespont (V) |
| Engraved lines | 9 hour lines, 2 day lines |
| Cone half-angle α | 22.1 ± 19.13° (cone residual on all points 0.53 mm) |
| Measured | 2026-06-12 20:14 |
What the dial shows at this latitude
| Winter solstice | Equinox | Summer solstice | |
|---|---|---|---|
| Noon altitude of the Sun | 27.4° | 51.1° | 74.8° |
| Noon shadow (gnomon heights) | 1.93 | 0.81 | 0.27 |
| Length of the day | 9.2 h | 12.0 h | 14.8 h |
| Length of a seasonal hour | 46 min | 60 min | 74 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. 230.
- – Schaldach, Karlheinz, Die antiken Sonnenuhren Griechenlands. Festland und Peloponnes, Frankfurt am Main, 2006, p.107, no. 15.
3D Models
