Celestial and T’errejlrial Globes. 119

problem xii. art. 189, &c. bring the centerof the artificial sun under the strong brassmeridian, and set the hour index to that XIIwhich is most elevated; turn the globe tothe given hour, and move the graduatededge of the quadrant to the center of theartificial fun ; and that degree on the qua-drant which is cut by the fun’s center, isthe fun’s height at that time.

The artificial fun being brought underthe strong brass meridian, and the quadrantlaid upon its center, will strew its meridian,or greatest altitude, for that day.

If the fun be in the equator, his greatestor meridian altitude is equal to the elevationof the equator, which is always equal to theco-latitude of the place.

Azimuth or vertical circles.

209. An azimuth circle in astronomy, isthe very fame as a circle of position ingeography; they being secondaries to thehorizon, or great circles pasting through thezenith of any place, and cresting the hori-zon at right angles: either in the heavens,called azimuths; or on the earth, circles ofposition.

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