DescriptionBritannica Armilla.jpg Drawing of an armilla, an astrolabe precursor. Date published 1911 Source Encyclopædia Britannica (11th ed.), v. 2, 1911...
DescriptionBritannica armilla.jpg English: An armillary sphere is a model of the celestial sphere made from several metal rings. Date 1910 Source "Armilla", The...
DescriptionBritannica armilla02.png Armillary sphere Date 1910 Source "Armilla", The Encyclopaedia Britannica, 11th ed., vol II (Andros – Austria), 1910...
