Chap. 1. That the planets move in a space empty of sensible matter | p. 161 |
The system of the world described | p. 162 |
The planets suffer no sensible resistance in their motion | p. 166 |
They are not kept in motion by a fluid | p. 168 |
That all space is not full of matter without vacancies | p. 169 |
Chap. 2. Concerning the cause that keeps in motion the primary planets | p. 171 |
They are influenced by a centripetal power directed to the sun | p. 171 |
The strength of this power is reciprocally in the duplicate proportion of the distance | ibid. |
The cause of the irregularities in the motions of the planets | p. 175 |
A correction of their motions | p. 178 |
That the frame of the world is not eternal | p. 180 |
Chap. 3. Of the motion of the moon and the other secondary planets |
That they are influenced by a centripetal force directed toward their primary, as the primary are influenced by the sun | p. 182 |
That the power usually called gravity extends to the moon | p. 189 |
That the sun acts on the secondary planets | p. 190 |
The variation of the moon | p. 193 |
That the circuit of the moons orbit is increased by the sun in the quarters, and diminished in the conjunction and opposition | p. 198 |
The distance of the moon from the earth in the quarters and in the conjunction and opposition is altered by the sun | p. 200 |
These irregularities in the moon’s motion varied by the change of distance between the earth and sun | p. 201 |
The period of the moon round the earth and her distance varied by the same means | ibid. |
The motion of the nodes and the inclination of the moons orbit | p. 202 |
The motion of the apogeon and change of the eccentricity | p. 218 |
The inequalities of the other secondary planets deducible from these of the moon | p. 229 |
Chap. 4. Of comets |
They are not meteors, nor placed totally without the planetary system | p. 230 |
The sun acts on them in the same manner as on the planets | p. 231 |
Their orbits are near to parabola’s | p. 233 |
The comet that appeared at the end of the year 1680, probably performs its period in 575 years, and another comet in 75 years | p. 234 |
Why the comets move in planes more different from one another than the planets | p. 235 |
The tails of comets | p. 238 |
The use of them | p. 243 244 |
The possible use of the comet it self | p. 245 246 |
Chap. 5. Of the bodies of the sun and planets |
That each of the heavenly bodies is endued with an attractive power, and that the force of the same body on others is proportional to the quantity of matter in the body attracted | p. 247 |
This proved in the earth | p. 248 |
In the sun | p. 250 |
In the rest of the planets | p. 251 |
That the attractive power is of the same nature in the sun and in all the planets, and therefore is the same with gravity | p. 252 |
That the attractive power in each of these bodies is proportional to the quantity of matter in the body attracting | ibid. |
That each particle of which the sun and planets are composed is endued with an attracting power, the strength of which is reciprocally in the duplicate proportion of the distance | p. 257 |
The power of gravity universally belongs to all matter | p. 259 |
The different weight of the same body upon the surface of the sun, the earth, Jupiter and Saturn; the respective densities of these bodies, and the proportion between their diameters | p. 261 |
Chap. 6. Of the fluid parts of the planets |
The manner in which fluids press | p. 264 |
The motion of waves on the surface of water | p. 269 |
The motion of sound through the air | p. 270 |
The velocity of sound | p. 282 |
Concerning the tides | p. 283 |
The figure of the earth | p. 296 |
The effect of this figure upon the power of gravity | p. 300 |
The effect it has upon pendulums | p. 302 |
Bodies descend perpendicularly to the surface of the earth | p. 304 |
The axis of the earth changes its direction twice a year, and twice a month | p. 313 |
The figure of the secondary planets | ibid. |