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index to the principia.
581
| Saturn, its periodic time, | 388 | |
| “ | its distance from the sun, | 388 |
| “ | its apparent diameter, | 388 |
| “ | its true diameter, | 399 |
| “ | its attractive force, how great, | 398 |
| “ | the weight of bodies on its surface, | 399 |
| “ | its density, | 399 |
| “ | its quantity of matter, | 399 |
| “ | its perturbation by the approach of Jupiter how great, | 403 |
| “ | the apparent diameter of its ring, | 388 |
| Shadow of the earth to be augmented in lunar eclipses, because of the refraction of the atmosphere, | 447 | |
| Sounds, their nature explained, | 360, 363, 365, 366, 367, 368, 369 | |
| “ | not propagated in directum, | 359 |
| “ | caused by the agitation of the air, | 368 |
| “ | their velocity computed, | 368, 369 |
| “ | somewhat swifter by the theory in summer than in winter, | 370 |
| “ | cease immediately, when the motion of the sonorous body ceases, | 365 |
| “ | how augmented in speaking trumpets, | 370 |
| Space, absolute and relative, | 78, 79 | |
| “ | not equally full, | 396 |
| Spheroid, the attraction of the same when the forces of its particles are reciprocally as the squares of the distances, | 239 | |
| Spiral cutting all its radii in a given angle, by what law of centripetal force tending to the centre thereof it may be described by a revolving body, | 107, 287, 291 | |
| Spirit pervading all bodies, and concealed within them, hinted at, as required to solve a great many phenomena of Nature, | 508 | |
| Stars, the fixed stars demonstrated to be at rest, | 404 | |
| “ | their twinkling what to be ascribed to, | 487 |
| “ | new stars, whence they may arise, | 502 |
| Substances of all things unknown, | 507 | |
| Sun, moves round the common centre of gravity of all the planeta, | 401 | |
| “ | the periodic time of its revolution about its axis, | 405 |
| “ | its mean apparent diameter, | 453 |
| “ | its true diameter, | 398 |
| “ | its horizontal parallax, | 398 |
| “ | has a menstrual parallax, | 403 |
| “ | its attractive force how great, | 398 |
| “ | the weight of bodies on its surface, | 399 |
| “ | its density, | 399 |
| “ | its quantity of matter, | 399 |
| “ | its force to disturb the motions of the moon, | 391, 419 |
| “ | its force to move the sea, | 448 |
| Tides of the sea derived from their cause, | 415, 448, 449 | |
| Time, absolute and relative, | 78, 79 | |
| “ | the astronomical equation thereof proved by pendulum clocks, and the eclipses of Jupiter's satellites, | 79 |
| A Vacuum proved, or that all spaces (if said to be full) are not equally full, | 396 | |
| Velocities of bodies moving in conic sections, where the centripetal force tends to the focus, | 121 | |
| Velocity, the greatest that a globe falling in a resisting medium can acquire, | 344 | |
| Venus, its periodic time, | 388 | |
| “ | its distance from the sun, | 388 |
| “ | the motion of its aphelion, | 405 |
| Vortices, their nature and constitution examined, | 504 | |
| Waves, the velocity with which they are propagated on the superficies of stagnant water, | 361 | |
| Weights of bodies towards the sun, the earth, or any planet, are, at equal distances from the centre, as the quantities of matter in the bodies, | 394 | |
| “ | they do not depend upon the forms and textures of bodies, | 395 |
| “ | of bodies in different regions of the earth found out, and compared together, | 409 |
