_Parallax_, Horizontal, what, 190.
_Parallel Sphere_, what, 131.
_Path_ of the Moon, 265, 266, 267.
Of Jupiter’s Moons, 269.
_Pendulums_, their vibrating slower at the Equator than near the Poles
proves that the Earth turns on it’s Axis, 117.
_Penumbra_, what, 336.
It’s velocity on the Earth in Solar Eclipses, 337.
_Period of Eclipses_, 320, 326.
_Phases of the Moon_, 252-268.
_Planets_, much of the same nature with the Earth, 11.
Some have Moons belonging to them, 12.
Move all the same way as seen from the Sun, but not as seen from one
another, 18.
Their Moons denote them to be inhabited, 86.
The proportional breadth of the Sun’s Disc as seen from each of them,
87.
Their proportional bulks as seen from the Sun, 88.
An idea of their distances from the Sun, 89.
Appear bigger and less by turns, and why, 90.
Are kept in their Orbits by the power of gravity, 101, 150-158.
Their motions very irregular as seen from the Earth, 137.
The apparent motions of Mercury and Venus delineated by Pencils in an
Orrery, 138.
Elongations of all the rest as seen from Saturn, 147.
Describe equal areas in equal times, 153.
The excentricities of their Orbits, 155.
In what times they would fall to the Sun by the power of gravity,
157.
Disturb one another’s motions, the consequence thereof, 163.
Appear dimmer when seen through telescopes than by the bare eye, the
reason of this, 170.
_Planetary Globe_ described, 439.
_Polar Circles_, 198.
_Poles_, of the Planets, what, 19.
Of the world, what, 122.
Celestial, seem to keep on the same points of the Heavens all the
year, and why, 196.
_Projectile Force_, 150;
if doubled would require a quadruple power of gravity to retain the
Planets in their Orbits, 153.
Is evidently an impulse from the hand of the ALMIGHTY, 161.
_Precession of the Equinoxes_, 246-251.
_Ptolemean_ System absurd, 96, 140.