Astronomy by Observation: An Elementary Text-book for High-schools and Academies

الغلاف الأمامي
D. Appleton, 1886 - 90 من الصفحات

Astronomy by Observation: An Elementary Text-Book for High-Schools and Academies by Eliza Bowen A., first published in 1886, is a rare manuscript, the original residing in one of the great libraries of the world. This book is a reproduction of that original, which has been scanned and cleaned by state-of-the-art publishing tools for better readability and enhanced appreciation.

Restoration Editors' mission is to bring long out of print manuscripts back to life. Some smudges, annotations or unclear text may still exist, due to permanent damage to the original work. We believe the literary significance of the text justifies offering this reproduction, allowing a new generation to appreciate it.

 

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الصفحة 49 - 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.
الصفحة 16 - These twelve parts are called the signs of the zodiac and are named after the constellations which occupy them. The names of the signs of the zodiac are: Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricornus, Aquarius, and Pisces.
الصفحة 3 - Academies, based on the most practical and interesting method of studying the subject — that of observation. To assist the pupil in his work, careful directions are given when, how, and where to find the heavenly bodies ; also for observing, in entertaining and instructive ways, the characteristics and phenomena of the constellations. Their motions are described in familiar language, in the order in which they can be seen by an observer. The...
الصفحة 61 - ... ring three or four minutes of arc in width, separated by a somewhat definite outline from the outer corona, which reaches to a much greater distance, and is far more irregular in form. Usually there are several rifts, as they have been called, like narrow beams of darkness, extending from the very edge of the sun to the outer night, and much resembling the cloud-shadows which radiate from the sun before a thunder-shower ; but the edges of these rifts are frequently curved, showing them to be...
الصفحة 3 - ... that of observation. To assist the pupil in his work, careful directions are given when, how, and where to find the heavenly bodies ; also for observing, in entertaining and instructive ways, the characteristics and phenomena of the constellations. Their motions are described in familiar language, in the order in which they can be seen by an observer. The large quarto pages admit maps and views on a scale that will give a clear conception of the vast expanse of the celestial regions.
الصفحة 49 - It is, that the squares of the periodic times of any two planets are to each other as the cubes of their mean distances from the sun...
الصفحة 53 - Or, to put it differently, if we could build up a solid column of ice from the earth to the sun, two miles and a quarter in diameter,- spanning the inconceivable abyss of ninetythree million miles, and if then the sun should concentrate his power upon it, it would dissolve and melt, not in an hour, nor a minute, but in a single second : one swing of the pendulum, and it would be water ; seven more, and it would be dissipated in vapor.
الصفحة 88 - The azimuth of a heavenly body is the arc of the horizon intercepted between the meridian and a vertical circle passing through the centre of the body.
الصفحة 76 - As seen in an opera glass, there are combinations of 2. As seen in a small telescope. 3. As seen in a telescope of triple, quadruple, and even great power.
الصفحة 62 - The known major planets are, in the order of their proximity to the sun, Mercury, Venus, the Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Mercury, Venus, Mars, Jupiter, and Saturn were known to the ancients. Uranus was accidentally discovered by...

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