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" The HORIZON is a great circle which separates the visible half of the heavens from the invisible ; the earth being considered as a point in the centre of the sphere of the fixed stars. "
An introduction to the theory ... of plane and spherical trigonometry ... - Page 258
by Thomas Keith - 1839
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An Introduction to the Theory and Practice of Plane and Spherical ...

Thomas Keith - 1810 - 478 pages
...syzygies; and the quartile aspects the quadratures: these terms are applied chiefly to the moon. (H) The horizon is a great circle which separates the...the earth's centre, is called the rational horizon. (I) The cardinal points are the east, west, north and south points of the horizon. The mariner's compass...
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A New Treatise on the Use of the Globes, Or, A Philosophical View of the ...

Thomas Keith - 1811 - 388 pages
...correspondent to the hours of the day ; and these are again subdivided into halves and quarters. 19. The HORIZON is a great circle which separates the...half of the heavens from the invisible. This horizon, when applied to the earth, is distinguished by the sensible and rational horizon. 2O. THE SENSIBLE,...
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A New Treatise on the Use of the Globes: Or, A Philosophical View of the ...

Thomas Keith - 1819 - 380 pages
...correspondent to the hours of the day ; and these are again subdivided into halves and quarters. 19. The HORIZON is a great circle which separates the...half of the heavens from the invisible. This horizon, when applied to the earth, ia distinguished by the sensible and rational horizon. 21. The RATIONAL,...
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An Introduction to the Theory and Practice of Plain and Spherical ...

Thomas Keith - 1826 - 504 pages
...syzygies, and die quartile aspects the quadratures ¡ these terms are applied chiefly to the moon. (H) The horizon is a great circle which separates the...the earth's centre, is called the rational horizon. (I) The cardinal points are the east, west, north and south, points of the horizon. The mariner's compass,...
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A New Treatise on the Use of the Globes: Or, A Philosophical View of the ...

Thomas Keith - 1826 - 360 pages
...round the axis of the globe, and the brass meridian, in this case, answers the purpose of an index. 20. The HORIZON is a great circle which separates the visible half of the heavens from the invisible ; the earth being considered as a point in the centre of the sphere of the fixed stars. Horizon, when...
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The New American Grammar of the Elements of Astronomy: On an Improved Plan ...

James Ryan - 1827 - 408 pages
...show ? CHAPTER IV. Of the wooden horizon, and other appendages to the terrestrial globe. , • o 1 . The horizon is a great circle which separates the visible half of tne heavens from the invisible ; the earth being considered as a point in the centre of the sphere...
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First Steps to Astronomy and Geography

First steps - 1828 - 456 pages
...sun's place, for it must be six signs distant. WILLIAM. What is the horizon ? MOTHER. That imaginary circle which separates the visible half of the heavens from the invisible, is called the horizon. The height of the sun, or of a star, above the Horizon, reckoning from the horizon...
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Encyclopaedia Americana: A Popular Dictionary of Arts, Sciences ..., Volume 5

Francis Lieber, Edward Wigglesworth, Thomas Gamaliel Bradford - 1831 - 650 pages
...to the hours of the day ; and these are again subdivided into halves and quarters. The horizon (qv) is a great circle, which separates the visible half of the heavens from the invisible ; the earth being considered as a point in the centre of the sphere of the fixed stars. Horizon, when...
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Guys̕ Elements of Astronomy: And, An Abridgement of Keiths' New Treatise on ...

Joseph Guy - 1832 - 412 pages
...round the axis of the globe, and the brass meridian, in this case, answers the purpose of an index. 20. The HORIZON is a great circle which separates the visible half of the heavens from the invisible ; the earth being considered as a point in the centre of the sphere of the fixed stars. Horizon, when...
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A Practical System of Modern Geography, Or, A View of the Present State of ...

Jesse Olney - 1835 - 298 pages
...small circle of brass, with an index or pointer, fixed to the north pole. Q. What is the Horizon? A. It is a great circle, which separates the visible half of the heavens from the invisible. Q. How is the horizon represented on the Artificial Globe? A. By the wooden circular frame on which...
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