Astronomical ring

It is known as the Astronomic Ring Dial (annulus astronomicus), the complete name of this instrument is the Universal Equinoctial Ring Sundial.

It is composed by a ring that extension the latitude scale, to a mobile ring now, a central bar fluted graded for the months of the year and a perforated cylinder, than moves over this.

This instrument indicate solar local time and to make astronomical measurements.
this instrument is not only a solar clock but also a model of the Earth and a compass.

Material: brass and wood base

Diameter: 100mm

Thickness: 6mm

Other characteristics:
detailed description of the functioning,
brief history of the instrument,
supplied with gift packaging.