• diameter: 10 cm,
  
  
• made of solid brass
  
  
• hardwood display stand included
  
  
• instrument  is fully functional
  
  
• beautifully detailed to exact replica precision
  
  
• information booklet included
  
  
• brass Plaque on bottom 'Anillo Astronòmico S. XVIII' translates to Astronomical Ring of the 18th Century. On the outer Ring are cities with corresponding degrees
  
  
• packed in elegant box
  
  
• instrument will indicate the solar local time

Although known as the astronomical ring, this instrument evolved directly from the armillary sphere, which dates back to Ptolemy times.

Armillary sphere is an astronomical model of the celestial sphere. The instrument is built of graduated metal rings (armillae) linking the poles and representing the equator, the ecliptic and meridians.

Our sundial is the model that has been simplified to two main rings, one to be aligned with the equator, one with the meridian.

The first sundial of this type was most likely designed by Anthony Thompson in 1652 and its use was widespread during 18th century.

The astronomical ring works with lattitude and time of year to give the correct time today.

The pointer located on top of the meridian ring (outer ring) is used to point to the desired lattitude. The inside ring is used as the hour ring. In the middle you have the bridge which has a marker to adjust the month. In the middle of the marker is a small hole which the sunlight passes through to reveal a sun spot on the inside of the equatorial (hour) ring, which in turns gives you the time.

Unlike the 6cm astronomical ring which can be relied upon to measure the time fairly accurately as far as sundials are concerned, this model is best used as a decoration.

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