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nation of any Point in the Ecliptic; ſuppoſe 20° of Leo. Bring that Point to the Meridian, and it hath 142° Right Ascension, and 14° North Declination.
Problem 15. To find what Point of the Ecliptic doth riſe, culminate, and ſet, at any day, hour, and minute propoſed; as September 4th, 3 hours, 42 minutes, P. M.—Rule.—Bring the day of the month to the hour and minute given, and you will find 5° of Capricorn riſing, and 11° of Scorpio tranſiting the Meridian, Southward; and, of course, 5° of Cancer ſetting, and 11° of Taurus on the Meridian, North.
Problem 16. May 24th, in the morning, the Sun was obſerved due Eaſt; What is his Altitude, and the Hour of the Day?—Find the Sun's place, 2s 3°. Bring it to the Prime Vertical, Eaſtward; lay the director through it into the Hour-Circle, and it ſhews the Time of the Morning to be 16m paſt 7, with 27° of Altitude, as was required.
Problem 17. To find the Diurnal Arc of any Star, or Planet, ſuppoſe the Virgin’s Spike, (being the Star to the eaſtern Horizon). Lay the director through it into the Hour-Circle, and it points to 5 minutes before 7, which is 5 hours, 5 minutes, A. M. this is its Semi diurnal Arc, which, doubled, makes 10 hours, 10 minutes, for the Diurnal Arc, or time of this Star’s duration above our Horizon; which, ſubtracted from 24 hours, leaves 13 hours, 50 minutes, for the Nocturnal Arc, or time of its stay below our
