Armiˊllary Sphere

Armiˊllary Sphere is when the greater and lesser Circles of the Sphere being made of Brass, Wood, &c. and put together in their natural Order, so as to represent the three Positions of those Circles in the Heavens, as in this Figure, where N P represents the North Pole, and S P the South Pole,a b the North Circle, and x y the South Polar Circle, each 23° 29’ distant from its respective Pole; and the two Tropicks as far removed from the Equator, as the Polar Circles are removed from the Poles. The Tropick of Cancer is represented by

, and that of Capricorn by

; also the Horizon by HO. Those Circles that pass through both Poles are called Meridians. The Earth is represented by the small Ball in the center of the Sphere, and the Sphere it self is made to turn round the Earth agreable to the Ptolemaick System; and by this Sphere the Positions, viz. A Right Sphere, an Oblique Sphere, and a Parallel Sphere (which see under the several Words) are truly represented according as the several Inhabitants of the Earth enjoy them; also the several Problems belonging to the Sphere, viz. the Time of Rising, Setting, and Culminating of the Planets in any Latitude, and consequently the Length of their Days and Nights.

Definition taken from The Universal Etymological English Dictionary, edited by Nathan Bailey (1736)

Archeus [with Chymists] * Aˊrmourers