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altitude angle astronomical astronomical units atmosphere axis azimuth bright Cassiopeia celestial equator celestial sphere centre circle comet constellation corona dark declination density determine direction disc Dist distance Double Stars earth earth's orbit earth's surface east eclipse equal equatorial exactly eye-piece feet force globe gravity heat heavenly bodies horizon inches instrument Jupiter known latitude length libration light longitude lunar lunar eclipse magnitude Mags mass mean measured meridian meridian circle meteoric method miles minutes moon moon's motion moving naked eye nearly nebula node object object-glass observations parallax perihelion period perturbations photosphere planet pole Pole-star position proper motion radius right ascension ring rotation satellite seen shadow sidereal sidereal period Sirius solar spectroscope spectrum star's sun's surface synodic synodic period telescope tide tion transit Uranus usually velocity Venus vernal equinox visible zenith
Сторінка 18 - Equinoctial, is the great circle in which the plane of the earth's equator produced intersects the surface of the celestial sphere.
Сторінка 174 - The radius vector of each planet describes equal areas in equal times. (3) The squares of the periods of the planets are proportional to the cubes of their mean distances from the su» ; ie, £12 : ia2 : : «!3 : a28. This is the so-called "Harmonic Law.
Сторінка 69 - ... prehistoric times, and have received fanciful names. Sometimes the arrangement of the stars bears a resemblance to the object after which the constellation is named; in general, however, no reason can be given for the way in which the stars have been grouped and named.
Сторінка 215 - 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...
Сторінка 227 - The inclination of the planet's equator to the plane of its orbit is very nearly 24° 50' (26° 21
Сторінка 75 - The obliquity of the ecliptic, which equals the angular distance of the pole of the heavens from the pole of the ecliptic, is not sensibly affected by precession.
Сторінка 215 - On it place a globe, two feet in diameter; this will represent the Sun; 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; Juno, Ceres, Vesta, and Pallas, grains of sand, in orbits of from 1000 to 1200 feet; Jupiter a moderate-sized orange...