ObjID500-1
‹ Ancient Sundials
Dialface ID 543
Abstract
Information on the Dialface ID 543 / Object ID 500
Measurements
Measurement record: pipeline ObjID 500, matched to this dialface by inventory number.
| Quality grade | B (completeness 91 %) |
|---|---|
| Dial surface | cone (preferred, not decisive) · fit residual mm: cone 2.54, cylinder 2.64, sphere 3.87 |
| Latitude φ | 54.80 ± 3.27° (consensus of witnesses) |
| Klima | Borysthenes (VII) |
| Engraved lines | 11 hour lines, 3 day lines |
| Cone half-angle α | not shown: the derived cone does not agree with the measured points (residual 14.1 mm; verified cones give under 1 mm); under review |
| Measured | 2026-06-12 20:50 |
What the dial shows at this latitude
| Winter solstice | Equinox | Summer solstice | |
|---|---|---|---|
| Noon altitude of the Sun | 11.5° | 35.2° | 58.9° |
| Noon shadow (gnomon heights) | 4.92 | 1.42 | 0.60 |
| Length of the day | 6.9 h | 12.0 h | 17.1 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
