ObjID511-1
‹ Ancient Sundials
Dialface ID 554
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Abstract
Information on the Dialface ID 554 / Object ID 511
Measurements
Measurement record: pipeline ObjID 511, matched to this dialface by inventory number.
| Quality grade | C (completeness 89 %) |
|---|---|
| Dial surface | cone (preferred, not decisive) · fit residual mm: cone 1.15, cylinder 1.65, sphere 9.25 |
| Latitude φ | 52.66 ± 0.20° (single witness: hours-WiSo-regression) |
| Engraved lines | 11 hour lines, 3 day lines |
| Cone half-angle α | 6.2 ± 0.29° (cone residual on all points 1.27 mm) |
| Measured | 2026-06-12 20:54 |
What the dial shows at this latitude
| Winter solstice | Equinox | Summer solstice | |
|---|---|---|---|
| Noon altitude of the Sun | 13.6° | 37.3° | 61.0° |
| Noon shadow (gnomon heights) | 4.12 | 1.31 | 0.55 |
| Length of the day | 7.3 h | 12.0 h | 16.7 h |
| Length of a seasonal hour | 37 min | 60 min | 83 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
- – Winter, Eva, Zeitzeichen. Zur Entwicklung und Verwendung antiker Zeitmesser, Berlin and Boston, 2013, p. 515.
3D Models
