PROB. XL. _The Day of the Month, and the Azimuth of any known Star being given; to find the Hour of the Night._ Having rectified the globe for the latitude and the Sun’s place, if the given Star be due North or South, bring it to the meridian, and the index will show the hour of the night. If the Star be in any other direction, fix the quadrant of altitude in the zenith, and set it to the Star’s azimuth in the horizon; then turn the globe about until the quadrant cuts the center of the Star, and the index will shew the hour of the night. The bearing of any point in the heavens may be found by the following methods. Having a meridian line drawn in two windows, that are opposite to one another, you may cross it at right angles with another line representing the East and West; from the point of the intersection describe a circle, and divide each quadrant into 90 degrees; then get a smooth board, of about 2 feet long, and ¾ foot broad (more or less, as you judge convenient) and on the back part of it fix another small board crossways, so that it may serve as a foot to support the biggest board upright, when it is set upon a level, or an horizontal plane. The board being thus prepared, set the lower edge of the smooth, or fore side of it, close to the center of the circle, then turn it about to the meridian, or to any azimuth point required (keeping the edge of it always close to the center) and casting your eye along the flat side of it, you will easily perceive what Stars are upon the meridian, or any other bearing that the board is set to. PROB. XLI. _Two known Stars having the same Azimuth, or the same Height, being given; to find the Hour of the Night._ Rectify the globe for the latitude, the zenith, and the Sun’s place. 1. When the two Stars are in the same azimuth, turn the globe, and also the quadrant about, until both Stars coincide with the edge thereof; then will the index shew the hour of the night; and where the quadrant cuts the horizon, is the common azimuth of both Stars. 2. If the two Stars are of the same altitude, move the globe so that the same degree on the quadrant will cut both Stars, then the index will shew the hour. This problem is useful when the quantity of the azimuth of the two Stars in the first case, or of their altitude in the latter case, is not known. _If two Stars were given, one on the meridian, and the other in the East or West part of the horizon; to find the Latitude._ Bring that Star which was observed on the meridian, to the meridian of the globe, and keep the globe from turning round its axis; then slide the meridian up or down in the notches, ’till the other Star is brought to the East or West part of the horizon, and that elevation of the Pole will be the _Latitude_ sought. PROB. XLII. _The Latitude, Day of the Month, and the Altitude of any known Star being given; to find the Hour of the Night._