ObjID505-1
‹ Ancient Sundials
Dialface ID 548
Abstract
Information on the Dialface ID 548 / Object ID 505
Measurements
Measurement record: pipeline ObjID 505, matched to this dialface by inventory number.
| Quality grade | B (completeness 67 %) |
|---|---|
| Dial surface | cone (preferred, not decisive) · fit residual mm: cone 0.51, cylinder 0.61, sphere 5.15 |
| Latitude φ | 61.64 ± 3.95° (consensus of witnesses) |
| Klima | nearest Borysthenes (2.1 sigma) |
| Engraved lines | 6 hour lines, 2 day lines |
| Cone half-angle α | 10.9° (cone residual on all points 0.52 mm) |
| Measured | 2026-06-12 20:52 |
What the dial shows at this latitude
| Winter solstice | Equinox | Summer solstice | |
|---|---|---|---|
| Noon altitude of the Sun | 4.7° | 28.4° | 52.1° |
| Noon shadow (gnomon heights) | 12.29 | 1.85 | 0.78 |
| Length of the day | 4.7 h | 12.0 h | 19.3 h |
| Length of a seasonal hour | 24 min | 60 min | 96 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
