A Text-book of General Astronomy: For Colleges and Scientific SchoolsGinn, 1888 - 551 стор. |
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altitude amount angle angular appear astronomical astronomical units atmosphere attraction axis body bright celestial celestial equator centre circle comet constellations corona course dark declination density determined diameter direction disc disturbing force earth earth's orbit earth's surface equal equator eye-piece give gravity heat Heliometer horizon inches instrument Jupiter latitude length less light longitude lunar eclipse magnitude Mars mass mean measured Mercury meridian meridian circle meteoric method micrometer miles minutes moon motion moving nearly nebula node object object-glass observations parallax particles passes pendulum perihelion period photosphere planet pole position prime vertical proper motion radius rays refraction result right ascension ring rotation satellite Saturn seen shadow sidereal solar solar eclipse spectroscope spectrum standard candle stars sun's surface sunlight supposed synodic period tail telescope temperature tide tion transit Uranus usually velocity Venus vernal equinox vertical visible whole
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Сторінка 334 - Mercury will be represented by a grain of mustard seed, on the circumference of a circle 164 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...
Сторінка 197 - CALORIE is the amount of heat required to raise the temperature of one kilogram of water one degree centigrade.
Сторінка 334 - 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...
Сторінка 334 - ... 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.
Сторінка 12 - The declination of a heavenly body is its angular distance north or south from the celestial equator, and is measured by the arc of the hour-circle passing through the object and intercepted between it and the equator.
Сторінка 215 - ... inversely proportional to the square of the distance of the body from the centre of the earth.
Сторінка 73 - ... now well known, so that the place which the moon will occupy is predicted in the Nautical Almanac for every hour of every Greenwich day, it is possible to deduce the Greenwich time at any moment when the moon is visible, by some observation which will determine her place among the stars. The almanac place, however, is the place at which the moon would be seen by an observer situated at the centre of the earth, and consequently the actual observations in most cases require rather complicated and...
Сторінка 173 - relative number" is formed in rather an arbitrary manner from the observation of the spots: representing this number by r, the formula is, r...
Сторінка 9 - The intersection of the plane of the Earth's Equator with the celestial sphere defines the celestial equator.
Сторінка 457 - Neptune). 5. There is a roughly regular progression of density, increasing both ways from Saturn, the least dense of all the planets in the system. As regards the planets themselves, we have 6. The plane of the planets' rotation nearly coinciding with that of the orbit (probably excepting Uranus).