_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.