ObjID406-1
‹ Ancient Sundials
Dialface ID 446
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Abstract
Information on the Dialface ID 446 / Object ID 406
Measurements
Measurement record: pipeline ObjID 406, matched to this dialface by inventory number.
| Quality grade | A (completeness 76 %) |
|---|---|
| Dial surface | sphere (decisive) · fit residual mm: cone 5.32, cylinder 5.37, sphere 0.84 |
| Latitude φ | 50.07 ± 0.77° (consensus of witnesses) |
| Klima | Borysthenes (VII) |
| Engraved lines | 11 hour lines, 2 day lines |
| Cone half-angle α | not shown: surface fit decisively sphere: cone-specific quantities do not apply |
| Measured | 2026-06-12 20:45 |
What the dial shows at this latitude
| Winter solstice | Equinox | Summer solstice | |
|---|---|---|---|
| Noon altitude of the Sun | 16.2° | 39.9° | 63.6° |
| Noon shadow (gnomon heights) | 3.44 | 1.20 | 0.50 |
| Length of the day | 7.8 h | 12.0 h | 16.2 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
