ObjID41-1
‹ Ancient Sundials
Dialface ID 40
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Abstract
The sundial has a rounded back and no additional ornaments.
Measurements
Measurement record: pipeline ObjID 41, matched to this dialface by inventory number.
| Quality grade | B (completeness 91 %) |
|---|---|
| Dial surface | sphere (decisive) · fit residual mm: cone 9.05, cylinder 10.58, sphere 0.89 |
| Latitude φ | 45.47 ± 5.69° (consensus of witnesses) |
| Klima | Mid-Pontus (VI), Massalia, Borysthenes (VII) |
| 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 20:45 |
What the dial shows at this latitude
| Winter solstice | Equinox | Summer solstice | |
|---|---|---|---|
| Noon altitude of the Sun | 20.8° | 44.5° | 68.2° |
| Noon shadow (gnomon heights) | 2.63 | 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. 154.
3D Models
