ObjID508-1
‹ Ancient Sundials
Dialface ID 551
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Abstract
Information on the Dialface ID 551 / Object ID 508
Measurements
Measurement record: pipeline ObjID 508, matched to this dialface by inventory number.
| Quality grade | B (completeness 68 %) |
|---|---|
| Dial surface | cone (decisive) · fit residual mm: cone 0.27, cylinder 0.60, sphere 4.57 |
| Latitude φ | 49.35 ± 5.17° (consensus of witnesses) |
| Klima | Borysthenes (VII), Mid-Pontus (VI), Massalia |
| Engraved lines | 7 hour lines, 2 day lines |
| Cone half-angle α | 20.2° (cone residual on all points 0.29 mm) |
| Measured | 2026-06-12 20:53 |
What the dial shows at this latitude
| Winter solstice | Equinox | Summer solstice | |
|---|---|---|---|
| Noon altitude of the Sun | 16.9° | 40.7° | 64.4° |
| Noon shadow (gnomon heights) | 3.28 | 1.16 | 0.48 |
| Length of the day | 7.9 h | 12.0 h | 16.1 h |
| Length of a seasonal hour | 39 min | 60 min | 81 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
3D Models
