Page:Description and Use of a New Celestial Planisphere.pdf/22

17 point of Aries, and counting Eatward round the Planisphere, and, with the celetial bodies, it is that degree of the Equinoctial that comes to the Meridian with any of them repectively; and the Right Acenion of every ign, degree, and point of the Ecliptic, is to be found the ame way, by bringing thoe points repectively to the Meridian, and the degree of the Equinoctial cut thereby, is the Right Acenion of that ign, or point required; and note! that 15° of this circle revolves through the Meridian in every hour, it being the 24th part of 360°, which the whole Circle contains.

Precept 3. , and, is the degree of the Equinoctial cut by the Horizon, at the time of the riing, and etting of any of the celetial bodies, or of any part of the Ecliptic, as may be required.

Precept 4. , is the difference between the Right, and Oblique Acenion; and with the Sun, it hows how much it ries and ets, before, and after ix o'clock.

Precept 5. is an Arc of the Ecliptic, beginning at the firt point of Aries; and if the Sun, or any celetial object, be in any particular ign, degree, and minute, as if in 24 degrees, 35 minutes, and 49 econds of Leo—we write it's Longitude thus—4$s$ 24° 35' 49". Oberve the ame rule in all other caes, as required.