ObjID506-1
‹ Ancient Sundials
Dialface ID 549
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Abstract
Information on the Dialface ID 549 / Object ID 506
Measurements
Measurement record: pipeline ObjID 506, matched to this dialface by inventory number.
| Quality grade | B (completeness 84 %) |
|---|---|
| Dial surface | cone (decisive) · fit residual mm: cone 0.66, cylinder 1.74, sphere 6.38 |
| Latitude φ | 55.50 ± 0.92° (consensus of witnesses) |
| Klima | nearest Borysthenes (6.3 sigma) |
| Engraved lines | 6 hour lines, 3 day lines |
| Cone half-angle α | 36.7 ± 0.54° (cone residual on all points 0.68 mm) |
| Measured | 2026-06-12 20:52 |
What the dial shows at this latitude
| Winter solstice | Equinox | Summer solstice | |
|---|---|---|---|
| Noon altitude of the Sun | 10.8° | 34.5° | 58.2° |
| Noon shadow (gnomon heights) | 5.25 | 1.46 | 0.62 |
| Length of the day | 6.7 h | 12.0 h | 17.3 h |
| Length of a seasonal hour | 34 min | 60 min | 86 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
