Lessons in Astronomy Including Uranography: A Brief Introductory Course Without Mathematics, for Use in Schools and Seminaries

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Сторінка 151 - The squares of the periods of the planets are proportional to the cubes of their mean distances from the sun ; that is, ti2 : k2 ,• ,• ai3 ,• (h3This is the so-called harmonic law.
Сторінка 152 - that every particle of matter in the universe attracts every other particle, with a force whose direction is that of the line joining the two, and whose magnitude is directly as the product of their masses, and inversely as the square of their distances from each other.
Сторінка 162 - 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...
Сторінка 163 - 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 196 - Direct your telescope to a point on the ecliptic in the constellation of Aquarius, in longitude 826°, and you will find within a degree of that place a new planet, looking like a star of about the ninth magnitude, and having a perceptible disc.
Сторінка 194 - U-ra'nus) was the first planet ever " discovered," and the discovery created great excitement and brought the highest honors to the astronomer. It was found accidentally by the elder Herschel on March 13, 1781, while " sweeping " for interesting objects with a seven-inch reflector of his own construction. He recognized it at once by its disc as something different from a star, but supposed it to be a peculiar sort of a comet, and its planetary character was not demonstrated until nearly a year had...
Сторінка 11 - Equinoctial, is the great circle in which the plane of the earth's equator produced intersects the surface of the celestial sphere.
Сторінка 163 - 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 75 - ... 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 50 - ... animal's neck, and reaches Theta in his ear. Epsilon (or Enif), the bright star 8° -northwest of Theta, marks his nose. The forelegs are in the northwestern part of the constellation just east of Cygnus, and are marked, one of them by the stars Eta and Pi, and the other by Iota and Kappa. This is the winged horse which sprang from the blood of Medusa, after Perseus had cut off her head. He fixed his residence on Mt. Helicon, where he was the favorite of the Muses, and after being tamed by Minerva...

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