Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Measuring Devices (hierarchy name)
5. measuring devices (instruments)
6. [measuring devices for extent]
7. timepieces
8. [timepieces by form]
9. sundials

Anotations

Scope note:

Sundials, of several varieties, whose dial plate is tilted so as to lie parallel to the earth's equator and whose gnomon is perpendicular to the plate at its center, pointing to the north celestial pole; the layout of the hour lines is not dependent on latitude.