THE THEORY AND PRACTICE OF FINDING THE LONGITUDE AT SEA OR LAND: TO WHICH ARE ADDED, VARIOUS METHODS OF DETERMINING THE LATITUDE OF A PLACE, AND VARIATION OF THE COMPASS; WITH NEW TABLES. BY ANDREW MACKAY, LL. d. f. r. s. Edin. HONORARY MEMBER OF THE LITERARY AND PHILOSOPHICAL SOCIETY OF NEWCASTLE- THE CORPORATION OF TRINITY-HOUSE, THE HONOURABLE IN TWO VOLUMES. THE THIRD EDITION, IMPROVED AND ENLARGED. Cæli enarrant Gloriam Dei. LONDON: PRINTED FOR LONGMAN, HURST, REES, AND ORME, FATERNOSTER-ROW- 1810. To reduce the true Altitude of a fixed Star to its apparent Altitude TABLES XIII. XIV. XV. AND XVI. To reduce the Declination of the Sun to any given Meridian, and to any For selecting a proper Star from which the Moon's Distance ought to be observed, that as little as possible of the Moon's proper Motion may be lost To reduce the Declination, Right Ascension, Horizontal Parallax, and Semidiameter of the Moon, to any given Meridian, and to any given Time under that Meridian To reduce the Time of the Moon's Passage over the Meridian of Greenwich to the ib. |