ObjID27-1
‹ Ancient Sundials
Dialface ID 27
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Abstract
This sundial's limbus is set off by a thin line. There is a pinkish colour in all of the hourlines and daycurves. The same colour is visible in the area above the winter solstice and the front part of the base. Gibbs: A gnomon hole 34 mm deep remains in the top surface of the dial.
Measurements
Measurement record: pipeline ObjID 27, matched to this dialface by inventory number.
| Quality grade | B (completeness 58 %) |
|---|---|
| Dial surface | sphere (decisive) · fit residual mm: cone 5.25, cylinder 6.03, sphere 0.85 |
| Latitude φ | 45.56 ± 0.02° (single witness: path-I-axis) |
| Engraved lines | 11 hour lines, 3 day lines |
| Cone half-angle α | not shown: surface fit decisively sphere: cone-specific quantities do not apply |
| Measured | 2026-06-12 20:38 |
What the dial shows at this latitude
| Winter solstice | Equinox | Summer solstice | |
|---|---|---|---|
| Noon altitude of the Sun | 20.7° | 44.4° | 68.2° |
| Noon shadow (gnomon heights) | 2.64 | 1.02 | 0.40 |
| Length of the day | 8.5 h | 12.0 h | 15.5 h |
| Length of a seasonal hour | 42 min | 60 min | 78 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. 142, p. 144, pl. 5.
3D Models
