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Zenith $19.99 Zenith |
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The Zenith $23.1 The Zenith |
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RAISED ON ZENITH: RAISED ON ZENITH $8.47 RAISED ON ZENITH: RAISED ON ZENITH |
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Increase $29.95 Increase is Lia Purpura''''s chronicle of her pregnancy, the birth of her son, Joseph, and the first year of his life... |
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Operation Zenith $11.91 Operation Zenith |
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Live at the Zenith $25.21 Live at the Zenith |
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OMASHAR: ZENITH $11.93 OMASHAR: ZENITH |
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Elastic Zenith $24.88 Elastic Zenith |
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Zenith 2007 $30 Zenith 2007 |
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Elements Of Astronomy $26.85 Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free.This is an OCR edition with typos.Excerpt from book:CHAP. IV. On Refraction and Twilight. 46. AS connected with the earth, we may here consider its atmosphere, and how it affects the apparent places of the heavenly bodies. We know, from the science of pneumatics, that the air surrounding the earth is an elastic fluid, the density of which is nearly proportional to the compressing force, or the weight of the incumbent air. Whence it follows that the density continually decreases, and at a few miles high becomes very small. Now a ray of light passing out of a rarer medium into a denser, is always bent out of its course toward the perpendicular to the surface, on which the ray is incident. It follows therefore that a ray of light must be continually bent in its course through the atmosphere, and describe a curve, the tangent to which curve, at the surface of the earth, is the direction in which the celestial object appears. Consequently the apparent altitude if always greater than the true. 47. The refraction or deviation is greater, the greater the angle of incidence, and therefore greatest when the object is in the horizon, The horizontal refraction is about 32'. At 45 altitude, in its mean quantity it is 57i". 48. The refraction is affected by the variation of the quantity or weight of the superincumbent atmosphere at a given place, and also by its temperature. In computing the quantity of refraction, the height of the barometer and thermometer must be noted. The quantity of refraction at the same zenith distance varies nearly as the height of the barometer, the temperature remaining constant. The effect of a variation of temperature is to diminish the quantity of refraction about T'5 part for every increase of one degree in the height of the thermometer. Therefore, in all accurate observations of altitude or zenith d |
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Elements Of Astronomy $20.75 Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free.This is an OCR edition with typos.Excerpt from book:CHAP. IV. On Refraction and Twilight. 46. AS connected with the earth, we may here consider its atmosphere, and how it affects the apparent places of the heavenly bodies. We know, from the science of pneumatics, that the air surrounding the earth is an elastic fluid, the density of which is nearly proportional to the compressing force, or the weight of the incumbent air. Whence it follows that the density continually decreases, and at a few miles high becomes very small. Now a ray of light passing out of a rarer medium into a denser, is always bent out of its course toward the perpendicular to the surface, on which the ray is incident. It follows therefore that a ray of light must be continually bent in its course through the atmosphere, and describe a curve, the tangent to which curve, at the surface of the earth, is the direction in which the celestial object appears. Consequently the apparent altitude if always greater than the true. 47. The refraction or deviation is greater, the greater the angle of incidence, and therefore greatest when the object is in the horizon, The horizontal refraction is about 32'. At 45 altitude, in its mean quantity it is 57i". 48. The refraction is affected by the variation of the quantity or weight of the superincumbent atmosphere at a given place, and also by its temperature. In computing the quantity of refraction, the height of the barometer and thermometer must be noted. The quantity of refraction at the same zenith distance varies nearly as the height of the barometer, the temperature remaining constant. The effect of a variation of temperature is to diminish the quantity of refraction about T'5 part for every increase of one degree in the height of the thermometer. Therefore, in all accurate observations of altitude or zenith d |
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