A Treatise on Astronomy, Descriptive, Physical and Practical: Designed for Schools, Colleges, and Private Students |
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Common terms and phrases
altitude angular apogee apparent diameter argument argument of latitude ascending node astronomers attraction axis body called central eclipse CHAP circle clock comet compute conjunction corresponding declination degrees difference Digits eclipsed earth earth's orbit eccentricity equa equal equation equinox Evection full moon give gravity greater greatest Greenwich heavens Hence horizontal parallax inferior planet interval Jupiter Kepler's Kepler's third law lunar orbit magnitude mass Mean Anomaly mean distance Mercury meridian minutes MOON'S HOURLY MOTION moon's latitude moon's motion moon's path nearly noon nutation observations opposite pass perigee perihelion period planet pole position proper motion proportion radial force radius refraction represent result revolution right angles right ascension ring round satellites Saturn semidiameter sidereal sine solar Subtract sun and moon syzigies tance tangent telescope tides tion transit triangle true tude Uranus variation velocity Venus
Popular passages
Page 139 - ... variations, and the appearances of spots seen upon them, render it extremely probable that they subsist in the atmosphere of the planet, forming tracts of comparatively clear sky, determined by currents analogous to our trade-winds, but of a much more steady and decided character, as might indeed be expected from the immense velocity of its rotation. That it is the comparatively darker body of the planet which appears in the belts is evident from this, — that they do not come up in all their...
Page 118 - The squares of the times of revolution are to each other as the cubes of the mean distances from the sun.
Page 89 - ... would not be supported. Whenever, then, the sun remains more than twelve hours above the horizon of any place, and less beneath, the general temperature of that place will be above the average; when the reverse, below. As the earth, then, moves from A to B, the days growing longer, and the nights...
Page 143 - 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; Juno, Ceres, Vesta, and Pallas, grains of sand, in orbits of from 1000 to 1200 feet; Jupiter a moderate-sized orange, in a circle nearly half a mile across...
Page 141 - That the ring is a solid opake substance, is shown by its throwing its shadow on the body of the planet on the side nearest the sun and on the other side receiving that of the body.
Page 144 - 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.
Page 80 - For, by the first of Kepler's laws, the areas described by the radius vector are proportional to the times, and when this is the case, by Art.
Page 143 - Venus a pea, on a circle of 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 ; the Asteroids, grains of sand, in orbits of from 1000 to 1200 feet; Jupiter a moderate-sized orange, in a circle nearly half a mile across...
Page 144 - 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 ; and 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.
Page 154 - If the sun has a motion in absolute space, directed towards any quarter of the heavens, it is obvious that the stars in that quarter must appear to recede from each other, while those in the opposite region...