Geodesy, the art of measuring the earth without reference to the heavenly bodies.
God, relation of, to the universe, [258].
Gravitation, laws of, [6]; extends to the stars, [13]; theories of, [253].
Gravity on different bodies, [6], [274].
Helical, rising or setting of a star, as near to sunrise or sunset as it can be seen.
Heliocentric, as seen from the centre of the sun.
Hoosac Tunnel, example of accuracy, [62].
Horizontal pendulum, [272].
Immersion, the disappearance of one body behind another, or in its shadow.
Inclination of an orbit, the angle between its plane and the plane of the ecliptic.