An armillary sphere basically allows you to find the position of an object in the sky in relation to the celestial equator, (equatorial AS or 赤道经纬仪) or the ecliptic (the path of the sun across the sky) (ecliptical AS or 黄道经纬仪). From Wordnik.com. [The Art of Chinese Astronomical Technology] Reference
Henry encountered, in their continuation of Chacornac's half-finished enterprise of ecliptical charting, sections of the Milky Way defying the enumerating efforts of eye and hand. From Wordnik.com. [A Popular History of Astronomy During the Nineteenth Century Fourth Edition] Reference
But neither did the ecliptical conflict of the moon impair our state, nor her clearing again amend us a whit; but the accustomed eclipse of the sea continued in his force, we being darkened more than the moon sevenfold. From Wordnik.com. [Sir Francis Drakes Famous Voyage Round the World] Reference
From the earliest times they had observed the twelve ecliptical "mansions" and zodiacal signs, and also that the time occupied by the sun in travelling through a mansion was rather longer than one lunation, or the time intervening between two new moons. From Wordnik.com. [Ancient China Simplified] Reference
In the days prior to GPS-led apparati that were brought to market in the ancient, early '90s, astro-purists with an interest in locating various objects from within the observable astronomical inventory would have to understand basic algebra as a gateway to leverage a coordinate system (celestrial, equatorial, ecliptical, galactic, etc.). From Wordnik.com. [Cool Tools] Reference
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