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altitude amount angle appears astronomical attraction average axis base body bright called cause changes circle clock comes comet conjunction cross curve dark declination described determined diameter diminishes direction disc distance earth east ecliptic equal equator equinoctial equinox fact feet fixed follows force gives greater half heat Hence horizon increases indicate Jupiter known latitude laws length less light longitude lunar marks Mars mass mean measured Mercury meridian miles millions moon moon's motion move nearly night node object observer occur opposite orbit parallax particles passes path period planet pole position radius rays reflected revolve ring rise rotation seems seen shadow shows side sidereal solar space star sun's supposed surface telescope tide tion transit turned vary Venus vertical visible zenith
Página 143 - The MASS of a body is the quantity of matter which it contains.
Página 237 - Uranus a full-sized cherry, or small plum, upon the circumference of a circle more than a mile and a half in diameter. As to getting correct notions on this subject by drawing circles on paper, or, still worse, from those very childish toys called orreries, it is out of the question.
Página 237 - Mercury will be represented by a grain of mustard seed, on the circumference of a circle 1 64 feet in diameter for its orbit; Venus a pea, on a circle 284 feet in diameter ; the Earth also a pea, on a circle of 430 feet; Mars a rather large pin's head, on a circle of 654 feet...
Página 126 - Hath left to their disputes, perhaps to move His laughter at their quaint opinions wide Hereafter ; when they come to model Heaven And calculate the stars, how they will wield The mighty frame ; how build, unbuild, contrive To save appearances ; how gird the sphere With centric and eccentric scribbled o'er, Cycle and epicycle, orb in orb...
Página 208 - ... she is in the meridian of that place ; and that the sun performs a secondary part in their production may be proved from the circumstance, that the highest tides take place when the sun, the moon, and the earth are in the same straight line, that is, when the force of the sun conspires with that of the moon, and that the lowest tides take place when the lines drawn from the sun and moon to the earth are at right angles to each other, that is, when the force of the sun acts in opposition to that...
Página 298 - Herculis. The velocity of this motion is such that the sun, with the whole cortege of bodies depending on him, advances annually in the direction indicated, through a space equal to 1.623 radii of the terrestrial orbit or one hundred and fifty-four millions of miles.
Página 13 - The vertical circle which passes through the north and south points of the horizon is the same as the celestial meridian, which will be defined hereafter (32).
Página 237 - ... feet; Jupiter a moderate-sized orange, in a circle nearly half a mile across; Saturn a small orange, on a circle of four-fifths of a mile; Uranus a full-sized cherry, or small plum, upon the circumference of a circle more than a mile and a half, and Neptune a good-sized plum on a circle about two miles and a half in diameter.
Página 82 - It is found to be always exactly perpendicular to the plane of the horizon; or, to a plane tangent to the surface of the earth at the point of observation.