37.(Pg. [78]) How does this occasion night and day?
38.(Pg. [78]) In what direction does the earth turn upon its axis, and what apparent motion of the sun, moon, and stars is thereby produced?
39.(Pg. [79]) What must be the appearance of the earth to an inhabitant of one of the planets?
40.(Pg. [79]) What the appearance of the sun to the inhabitants of planets in other systems?
41.(Pg. [79]) What the appearance of the earth to an inhabitant of the moon?
CONVERSATION VII.
OF THE PLANETS.
OF THE SATELLITES OR MOONS. GRAVITY DIMINISHES AS THE SQUARE OF THE DISTANCE. OF THE SOLAR SYSTEM. OF COMETS. CONSTELLATIONS, SIGNS OF THE ZODIAC. OF COPERNICUS, NEWTON, &c.
MRS. B.
The planets are distinguished into primary and secondary. Those which revolve immediately about the sun are called primary. Many of these are attended in their course by smaller planets, which, revolve round them: these are called secondary planets, satellites, or moons. Such is our moon which accompanies the earth, and is carried with it round the sun.