In Starland with a Three-inch Telescope: A Conveniently Arranged Guide for the Use of the Amateur Astronomer, with Forty Diagrams of the Constellations and Eight of the Moon

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Putnam, 1909 - Astronomy - 146 pages

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Page 86 - Water cannot possibly exist as a liquid on the moon, for the temperature of the moon's surface during the long lunar night is probably not far from 460 degrees below the zero mark on a Fahrenheit thermometer.
Page 48 - Messier discovered this in 1764, and described it " a mass of stars of a square form without any nebulosity, extending to about 15' of a degree;" but it is singular that the palpable cruciform shape of the most clustering part did not attract his notice. It is an oblique cross, with a pair of large stars in each arm, and a conspicuous single one in the centre ; the whole followed by a bright individual of the 7th magnitude.
Page 86 - The earth reflects to the moon about fourteen times as much light as the moon sends to the earth. It is best to observe the moon with a low power, and under the varying conditions of sunrise and sunset, "which, like the corresponding times of the earth, abound with grand and beautiful effects of light and shade." The best view of an object on the moon's surface is to be had when it is on the terminator, as the boundary line between the illuminated and the unilluminated portions of the moon is called....
Page 85 - A telescope which magnifies only one hundred times will show a spot on the moon's surface whose diameter is 1223 yards. One which magnifies a thousand times will enable us to perceive objects on her surface whose dimensions are only 122 yards, which does not much exceed the size of the Capitol at Washington. The highest power yet applied to the moon, a power of six thousand, brings her to an apparent distance of forty miles.
Page 85 - ... every change and modification in the appearance of particular spots carefully marked and represented in a series of delineations, it might lead to some certain conclusions, both as to her physical constitution, and her ultimate destination. It can be demonstrated, that a telescope which magnifies 100 times, will show a spot on the Moon's surface, whose diameter is 1223 yards ; and one which magnifies a thousand times, will...
Page 76 - At that time it was of the most intense crimson, resembling a blood-drop on the black ground of the sky. As regards depth of color, no other star visible in these latitudes could be compared to it.
Page 115 - ... once upon its axis. A point on Jupiter's equator moves about twenty-seven thousand miles, or considerably more than the entire circumference of the earth, in a single hour. The effect of this motion is clearly perceptible to the observer with a telescope on account of the diversified markings and colors of the moving disk, and to watch it is one of the greatest pleasures that the telescope affords.

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