_Harmony_ of the celestial motions, 111.
_Harvest-Moon_, 273-293.
None at the Equator, 273.
Remarkable at the Polar Circles, 285.
In what years most and least advantageous, 292.
_Heat_, decreases as the square of the distance from the Sun increases,
169.
Why not greatest when the Earth is nearest the Sun, 205.
Why greater about three o’Clock in the afternoon than when the Sun is
on the Meridian, 300.
_Heavens_, seem to turn round with different velocities as seen from
the different Planets; and on different Axes as seen from most of
them, 120.
Only one Hemisphere of them seen at once from any one Planet’s
surface, 125.
The Sun’s Center the only point from which their true Motions could
be seen, 135.
Changes in them, 403.
_Horizon_, what, 125, _n._
_Horizontal-Moon_ explained, 187.
_Horizontal Parallax_, of the Moon, 190;
of the Sun, 191;
best observed at the Equator, 193.
_Hour-Circles_, what, 208.
_Hour_ of time equal to 15 degrees of motion, _ib._
How divided by the _Jews_, _Chaldeans_, and _Arabians_, 419.