INDEX. The numeral Figures refer to the Pages, and the A. ACCELERATION of the stars, 160. Eras or epochs, 421.` Angle, under which an object appears, what, 128, n. Anomaly, what, 176. Ancients, their superstitious notions of eclipses, 303. Their method of dividing the zodiac, 381. Antipodes, what, 86. Apsides, line of, 176. ARCHIMEDES, his ideal problem for moving the Earth, 112. Astronomy, the great advantages arising from it both in our Discovers the laws by which the planets move, and are Atmosphere, the higher the thinner, 121. Its prodigious expansion, 121. Its whole weight on the Earth, 122. Generally thought to be heaviest when it is lightest, 123. 123. Is the cause of twilight, 124. Its height, 124. Refracts the Sun's rays, 124. Causeth the Sun and Moon to appear above the horizon Foggy, deceives us, in the bulk and distance of objects, 129. Attraction, 76. Decreases as the square of the distance increases, 76. 112. Axes of the planets, what, 38. Their different positions with respect to one another, 83. Axis of the Earth, its parallelism, 145. Its position variable as seen from the Sun or Moon, 308. B. Bodies, on the Earth, lose of their weight the nearer they How they might lose all their weight, 83. How they become visible, 117. C. Calculator (an instrument) described, 437. Calendar, how to inscribe the Golden numbers right in it Cannon-ball, its swiftness, 68. In what times it would fly from the Sun to the different CASSINI, his account of a double star eclipsed by the Moon, 53. His diagrams of the paths of the planets, 98. Catalogue of the eclipses, 282. Of the constellations and stars, 382. Of remarkable æras and events, 421. Celestial globe improved, 447. Centripetal and centrifugal forces, how they alternately over Circles, of perpetual apparition and occultation, 91. Contain 360 degrees whether they be great or small, 152. COLUMBUS (CHRISTOPHER) his story concerning an eclipse, 303. Clocks and watches, an easy method of knowing whether they Why they seldom agree with the Sun if they go true, 168-181. How to regulate them by equation-tables and a meridian- Constellations, ancient, their number, 380. The number of stars in each, according to different as tronomers, 382. Cycle, solar, lunar, and Roman, 395. D. Darkness at our SAVIOUR'S crucifixion supernatural, 317- 416. Day, natural and artificial, what, 394. And night, always equally long at the equator, 90. Natural, not completed in an absolute turn of the Earth Degree, what, 152. Direction, (number of), 412. Distances of the planets from the Sun, an idea of them, 68. How found, 132; and in the Dissertation on the transit of Diurnal and annual motions of the earth illustrated, 141- Dominical letter, 413. Double projectile force, a balance to a quadruple power of Double star covered by the Moon, 52. E. Earth, its bulk but a point as seen from the Sun, 32. Its diameter, annual period, and distance from the Sun, 49. Turns round its axis, 49. Velocity of its equatorial parts, 49. Velocity in its annual orbit, 49. Inclination of its axis, 49. Proof of its being globular, or nearly so, 50, 261. Difference between its equatorial and polar diameters, 59. 77, 78, by Dr. BRADLEY'S observations, 80, by the Its diurnal motion highly probable from the absurdity that Objections against its motion answered, 80, 85. It has no such thing as an upper or an under side, 86. in The swiftness of its motion in its orbit compared with Its diurnal and annual motions illustrated by an easy ex- Proved to be less than the Sun, and bigger than the Moon, 262. Easter cycle, 412. Eclipsareon (an instrument) described, 458. Eclipses of Jupiter's satellites, how the longitude is found 156. Of the Sun and Moon, 261-316, Why they happen not in every month, 263. When they must be, 263. Their limits, 264. Their period, 268. A Dissertation on their progress, 268. A large catalogue of them, 282. Historical ones, 301. More of the Sun than of the Moon, and why, 303. The proper elements for their calculation and projection, $18. Ecliptic, its signs, their names and characters, 68. Makes different angles with the horizon every hour and Its obliquity to the equator less now than it was formerly, 388. Elongations, of the planets, as seen by an observer at rest on Of Mercury and Venus, as seen from the Earth, illus- Of Mercury, Venus, the Earth, Mars, and Jupiter; their Equation of time, 165-181, Equator, day and night always equal there, 90. Makes always the same angle with the horizon of the Equinoctial points in the heavens, their precession, 181, a Eccentricities of the planets' orbits, 110. |