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" Earth's centre ; or, it is the angle under which the semidiameter of the Earth would appear, as seen from the object. The true place of a celestial body, is that point of the heavens in which it would be seen by an eye placed at the centre of the Earth. "
A Treatise on Surveying and Navigation: Uniting the Theoretical, Practical ... - Page 200
by Horatio Nelson Robinson - 1858 - 347 pages
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A Treatise on Plane and Spherical Trigonometry: With Their Most Useful ...

John Bonnycastle - Trigonometry - 1806 - 464 pages
...the earth would appear if seen directly from the centre of the sun, or a planet. Parallax in altitude is the angle under which the semidiameter of the earth would appear if seen obliquely from the centre of the sun, or a planet (a-). (t>) As the i of depression, or dip...
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A London Encyclopaedia, Or Universal Dictionary of Science, Art ..., Volume 3

Thomas Curtis - Aeronautics - 1829 - 852 pages
...obtnined by finding the horizontal parallax of the body whose distance is desired to be known; that is, the angle under which the semidiameter of the earth would appear provided we could see it from that body. In general the parallax of a planet is the différence between...
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The Geography of the Heavens, and Class Book of Astronomy: Accompanied by a ...

Elijah Hinsdale Burritt - Astronomy - 1838 - 350 pages
...surface, and the altitude of the same object, seen at the same time from the Earth's centre ; or, it is the angle under which the semidiameter of the Earth would appear, as seen from the object. The true place of a celestial body, is that point of the heavens in which it would be seen...
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A High-school Astronomy: In which the Descriptive, Physical, and Practical ...

Hiram Mattison - Astronomy - 1856 - 254 pages
...surface, and the altitude of the same object seen at the same time from the earth's center ; or it is the angle under which the semi-diameter of the earth would appear, as seen from the object. The true place of a celestial body is that point of the heavens in which it would be seen...
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The Geography of the Heavens and Class-book of Astronomy: Accompanied by a ...

Elijah Hinsdale Burritt - Astronomy - 1856 - 358 pages
...surface, and the altitude of the same object seen at the same time from the Earth's center ; or it is the angle under which the semi-diameter of the Earth would appear, us seen from the object. The true place of a celestial body is that point of the heavens in which it...
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An Elementary Class Book on Astronomy in which Mathematical Demonstrations ...

Horatio Nelson Robinson - Astronomy - 1860 - 230 pages
...diameter, and magnitude of each and every planet in the solar system. Let the reader bear in mind that the horizontal parallax of any body is the angle under which the semi-diameter of the earth appears, as seen from that body. The apparent semidiameter of the body, and the earth's horizontal...
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A New Treatise on Surveying and Navigation, Theoretical and Practical: With ...

Horatio Nelson Robinson - Navigation - 1878 - 564 pages
...is the parallax corresponding to the apparent altitude hAH. Draw Am parallel to Ch ; then mAH will be the true altitude. From this figure we draw the...little parallax, and the fixed stars none at all. Let CH and Ch be each represented by R. Pnt^> = tlie horizontal parallax, and x = the parallax in altitude,...
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