Elements of Astronomy: Illustrated with Plates, for the Use of Schools and Academies, with Questions

Cummings, Hilliard & Company, 1825 - 151 σελίδες

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Σελίδα 27 - It is a time-piece that advances very regularly near four minutes a day, and no other group of stars exhibits, to the naked eye, an observation of time so easily made. How often have we heard our guides exclaim in the savannahs of Venezuela, or in the desert extending from Lima to Truxillo, 'Midnight is past, the Cross begins to bend!
Σελίδα 27 - We saw distinctly, for the first time, the cross of the south, only in the night of the 4th and 5th of July, in the sixteenth degree of latitude. It was strongly inclined, and appeared, from time to time, between the clouds, the centre of which, furrowed by uncondensed lightnings, reflected a silver light. The pleasure felt on discovering the southern cross was warmly shared by such of the crew as had lived in the colonies.
Σελίδα 27 - The two great stars which mark the summit and the foot of the Cross having nearly the same right ascension, it follows hence, that the constellation is almost perpendicular at the moment when it passes the meridian.
Σελίδα 104 - Passing on, he was struck with surprise at seeing a spot of ground which he knew to have been recently turfed over, all torn up, and the earth looking fresh, as if from recent violence. Coming to the place, he found a great mass of fragments of a strange looking stone, and immediately called for his wife, who was second on the ground. Here were exhibited the most striking proofs of violent ^collision. A ridge of micaceous schistus lying nearly even with the ground, and somewhat inclining like the...
Σελίδα 109 - The cycle of the moon, чиЬ«т. commonly called the golden number, is a revolution of 19 years ; in which time, the conjunctions, oppositions, and other aspects of the moon, are within an hour and a half of being the same as they were on the same days of the months 19 years before.
Σελίδα 33 - Let us return to the consideration of terrestrial latitude and longitude. As the latitude of a place is its distance from the equator measured on its meridian, and all meridians are great circles and consequently equally large, it is obvious that a degree, or ^-J^ part, of one is equal to the same part of another.
Σελίδα 99 - Bonpland relates, that from the beginning of the phenomenon there was not a space in the firmament equal in extent to three diameters of the moon, that was not filled at every instant. with bolides and falling stars.
Σελίδα 7 - ... inversely proportional to the square of the distance of the planet from the sun.

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