The numeral Figures refer to the Articles, and the small n to the Notes on the Articles.

• A.
• Acceleration of the Stars, 221.
• Angle, what, 185.
• Annual Parallax of the Stars, 196.
• Anomaly, what, 239.
• Antients, their superstitious notions of Eclipses, 329.
  • Their method of dividing the Zodiac, 398.
• Antipodes, what, 122.
• Apsides, line of, 238.
• Archimedes, his ideal Problem for moving the Earth, 159.
• Areas described by the Planets, equal in times, 153.
• Astronomy, the great advantages arising from it both in our religious and civil concerns, 1 Discovers the laws by which the Planets move, and are retained in their Orbits, 2
• Atmosphere, the higher the thinner, 174.
  • It’s prodigious expansion, ib.
  • It’s whole weight on the Earth, 175.
  • Generally thought to be heaviest when it is lightest, 176.
  • Without it the Heavens would appear dark in the day-time, 177.
  • Is the cause of twilight, ib.
  • It’s height, ib.
  • Refracts the Sun’s rays, 178.
  • Causeth the Sun and Moon to appear above the Horizon when they are really below it, ib.
  • Foggy, deceives us in the bulk and distance of objects, 185.
• Attraction, 101-105.
  • Decreases as the square of the distance increases, 106.
  • Greater in the larger than in the smaller Planets, 158.
  • Greater in the Sun than in all the Planets if put together, ib.
• Axes of the Planets, what, 19.
  • Their different positions with respect to one another, 120.
• Axis of the Earth, it’s parallelism, 302.
  • It’s position variable as seen from the Sun or Moon, 338.
    • the Phenomena thence arising, 340.
• B.
• Bodies, on the Earth, lose of their weight the nearer they are to the Equator, 117.
  • How they might lose all their weight, 118,
  • How they become visible, 167.
• C.
• Calculator, (an Instrument) described, 436.
• Calendar, how to inscribe the Golden Numbers rightly in it for shewing the days of New Moons, 423.
• Cannon-Ball, it’s swiftness, 89.
  • In what times it would fly from the Sun to the different Planets and fixed Stars, ib.
• Cassini, his account of a double Star eclipsed by the Moon, 58.
  • His Diagrams of the Paths of the Planets, 138.
• Catalogue of the Eclipses, 327.
  • Of the Constellations and Stars, 367.
  • Of remarkable Æras and events, 433.
• Celestial Globe improved, 438.
• Centripetal and centrifugal forces, how they alternately overcome each other in the motions of the Planets, 152-154.
• Changes in the Heavens, 403.
• Chords, line of, how to make, 369.
• Circles, of perpetual Apparition and Occultation, 128.
  • Of the Sphere, 198.
  • Contain 360 Degrees whether they be great or small, 207.
• Civil Year, what, 411.
• Co /li>
• Has four Moons, 72,
  • their grand Period, 73,
  • the Angles which their Orbits subtend as seen from the Earth, 74,
  • most of them are eclipsed in every revolution, 75.
• The great difference between it’s equatoreal and polar Diameters, 76.
• The inclination of it’s Orbit, and place of it’s Ascending Node, 77.
• The Sun’s light 3000 times as strong on it as Full Moon-light is on the Earth, 85.
• Is probably inhabited, 86.
• The amazing strength required to put it in motion, 158.
• The figures of the Paths described by it’s Satellites, 269.

L.

Light, the inconceivable smallness of it’s particles, 165,

• • and the dreadful mischief they would do if they were larger, 166.
• It’s surprising velocity, 166,
  • compared with the swiftness of the Earth’s annual motion, 197.
• Decreases as the square of the distance from the luminous body increases, 169.
• Is refracted in passing through different Mediums, 171-173.
• Affords a proof of the Earth’s annual motion, 197, 219.
• In what time it comes from the Sun to the Earth, 216,
  • this explained by a figure, 217.

Limits of Eclipses, 317.

Line, of the Nodes, what, 317;

• • has a retrograde motion, 319.
• Of Sines and Chords, how to make, 369.

Long (Rev. Dr.) his method of comparing the quantity of the surface of dry land with that of the Sea, 51.

• His glass sphere, 126.

Longitude, how found, 207-213.

Lucid Spots in the Heavens, 401.

Lunar Cycle deficient, 422.

M.

Magellanic Clouds, 402.

Man, of a middle size, how much pressed by the weight of the Atmosphere, 175;

• why this pressure is not felt, ib.

Mars, it’s Diameter, Period, Distance, and other Phenomena, 64-67.

Matter, it’s properties, 99.

Mean Anomaly, what, 239.

Mercury, it’s Diameter, Period, Distance, &c. 22.

• Appears in all the shapes of the Moon, 23.
• When it will be seen on the Sun, 24.
• The inclination of it’s Orbit and Place of it’s Ascending Node, ib.
• It’s Path delineated, 138.
• Experiment to shew it’s Phases and apparent Motion, 142.

Mercury (Quicksilver) in the Barometer, why not affected by the Moon’s raising Tides in the Air, 311.

Meridian, first, 207.

• Line, how to draw one, 226.

Milky Way, what, 400.

Months, Jewish, Arabian, Egyptian, and Grecian, 415.

Moon, her Diameter and Period, 52.

• Her phases, 53, 255.
• Shines not by her own light, 54.
• Has no difference of seasons, 55.
• The Earth is a Moon to her, 136.
• Sphere, parallel, oblique, and right, 131.
  • It’s Circles, 198.
• Spring and Neap Tides, 302.
• Stars, their vast distance from the Earth, 3, 196.
  • Probably not all at the same distance, 4 Shine by their own light, and are therefore Suns 7,
    • probably to other worlds, 8 A demonstration that they do not move round the Earth, 111.
  • Have an apparent slow motion round the Poles of the Ecliptic, and why, 251.
  • A catalogue of them, 399.
  • Cloudy, 402.
  • New, 403.
  • Some of them change their places, 404.
• Starry Heavens have the same appearance from any part of the Solar System, 132.
• Sun appears bigger than the Stars, and why, 4 Turns round his Axis, 18.
  • His proportional breadth as seen from the different Planets, 87.
  • Describes unequal arcs above and below the Horizon at different times, and why, 130.
  • His Center the only place from which the true motions of the Planets could be seen, 135.
  • Is for half a year together visible at each Pole in it’s turn, and as long in visible, 200, 294.
  • Is nearer the Earth in Winter than in Summer, 205.
  • Why his motion agrees so seldom with the motion of a well regulated Clock, 224-245.
  • Would more than fill the Moon’s Orbit, 271.
  • Proved to be much bigger than the Earth, and the Earth to be bigger than the Moon, 315.
  • To calculate his true place, 360.
• Systems, the Solar, 17-95;
  • the Ptolemean, 96;
  • the Tychonic, 97.
• T.
• Table, of the Periods, Revolutions, Magnitudes, Distances, &c. of the Planets, facing § 99.
  • Of the Air’s rarity, compression, and expansion at different heights, 174.
  • Of refractions, 182.
  • For converting time into motion, and the reverse, 220.
  • For shewing how much of the celestial Equator passes over the Meridian in any part of a mean Solar Day; and how much the Stars accelerate upon the mean Solar time for a month, 221.
  • Of the first part of the Equation of time, 229;
    • of the second part, 241.
  • Of the precession of the Equinox, 247.
  • Of the length of Sidereal, Julian, and Tropical Years, 251.
  • Of the Sun’s place and Anomaly, following 251.
  • Of the Equation of natural Days, following 251
  • Of the Conjunctions of the hour and minute hands of a Watch, 264.
  • Of the Curves described by the Satellites, 272.
  • Of the difference of time in the Moon’s rising and setting on the parallel of
    • London every day during her course round the Ecliptic, 277.
  • Of Eclipses, 327.
  • For calculating New and Full Moons and Eclipses, following 390.
  • Of the Constellations and number of the Stars, 399.
  • Of the Jewish, Egyptian, Arabic, and Grecian months, 415.
  • For inserting the Golden Numbers right in the Calendar, 423.
  • Of the times of all the New Moons for 76 years,
                                                                                                                                                                                                                                                                                                               
    
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