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" The mean value of k' is about 57", which may be employed when a very precise result is not required. Fig. 17. DIP OF THE HORIZON. 121. The dip of the horizon is the angle of depression of the visible sea horizon below the true horizon, arising from the... "
A Manual of Spherical and Practical Astronomy: Spherical astronomy - Page 164
by William Chauvenet - 1863
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New American Practical Navigator

1821 - 708 pages
...depression of the visible horizon below the true or sensible horizon (touching the earth at the observer) arising from the elevation of the eye of the observer above the level of the sea. Thus in Plate IX. fig. 1. let ABC represent a section of the earth, whose plane produced passes through...
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The New American Practical Navigator: Being an Epitome of Navigation ...

Nathaniel Bowditch - 1826 - 764 pages
...depression of the visible horizon below the true or sensible horizon (touching the earth at the observer) arising from the elevation of the eye of the observer above the level of the sea. Thus ¡n Plate IX. Fig. 1. let ABC represent a section of the earth, whose plane produced passes through...
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The New American Practical Navigator: Being an Epitome of Navigation ...

Nathaniel Bowditch - 1826 - 732 pages
...depression of the visible horizon below the true or sensible horizon (touching the earth at the observer) arising from the elevation of the eye of the observer above the level of the sea. Thus in Plate IX. Fig. 1. let ABC represent a section of the earth, whose plane produced pass« s through...
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An Essay on the Use of the Spirit Level: As Applied to Engineering and Other ...

Thomas Oswald Blackett - 1838 - 154 pages
...distance of one ship from another, or the distance of any vessel from land when just visible, the height of the eye of the observer above the level of the sea or horizontal line being known ; and we may also determine the extent of vision on the surface of the...
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An Epitome of Navigation and Nautical Astronomy with the Improved Lunar Tables

Janet Taylor - 1842 - 592 pages
...contains a correction (to be applicd by subtraction * to the observed altitude of a celestial object,) arising from the elevation of the eye of the observer above the level of the sea horizon ; thus, the hcight of the eye bcing 22 feet the correction or dip is 4' 30". TABLE 9. Dip of...
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The New American Practical Navigator; Being an Epitome of Navigation ...

Nathaniel Bowditch - 1846 - 854 pages
...depression of the visible horizon below the true or sensible horizon (touching the earth at the observer), arising from the elevation of the eye of the observer above the level of the sea. Thus, in Plate XIL, figure 1, let ABC represent a vertical section of the earth, whose plane, being...
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The Mechanics' Magazine, Volume 59

1853 - 564 pages
...tee along the surface of the water ; and by what law the vuible distances vary? Let x be the height of the eye of the observer above the level of the sea; then, the diameter of the earth being assumed 8,000 miles, and d the required distance X (8,000+z)=d2,...
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A Manual of Spherical and Pratical Astronomy: Embracing the ..., Volume 1

William Chauvenet - 1864 - 720 pages
...them from the ctt'cct of refraction. The mean value of k' is about 57", which may be employed when a very precise result is not required. Fig. 17. DIP...to the vertical line (Art. 3). Let a vertical plane bo passed through CZ, and let BTD be the intersection of this plane with the earth's surface regarded...
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A Manual of Spherical and Astronomy: Embracing the ..., Part 32, Volume 1

William Chauvenet - 1864 - 726 pages
...The mean value of k f is about 57", which may be employed when a very precise result is not required. DIP OF THE HORIZON. 121. The dip of the horizon is...Fig. 17, be the vertical line of an observer at A, whoso height above the level of the Fig - 17> sea is AB. The plane of the true horizon of the observer...
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The American Practical Navigator: Being an Epitome of Navigation and ...

Nathaniel Bowditch - 1888 - 704 pages
...take the observations at a time when the object is more than 10° above the horizon. DIP. Art* 251. Dip of the horizon is the angle of depression of the...the eye of the observer above the level of the sea. In Fig. 6} suppose A to be the position of an observer whose height above the level of the sea is AB....
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