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An oblique equator is a great circle the plane of which is perpendicular to the axis of an oblique projection.
Elements of Trigonometry, Plane and Spherical: Adapted to the Present State ... - Page 83
by Charles William Hackley - 1838 - 307 pages

## Geographical Compilation for the Use of Schools: Being an Accurate ..., Volume 1

Denis Louis Cottineau de Kloguen - 1806 - 452 pages
...four lefs, viz : the two Tropics, and two Polar circles. Q. What is the Equator ? A. The Equator is a great circle, the plane of which is perpendicular to the axis of the world, and which divides the Sphere into two equal parts or Htmiffhere!, called Northern and Southern...

## A Treatise on Trigonometry, Plane and Spherical: With Its Application to ...

Charles William Hackley - 1851 - 536 pages
...Astronomy. To illustrate therefore the above and subsequent formulas of spherical trigonometry we shall introduce a few great circles of the celestial sphere....ecliptic is a great circle which makes an angle of about 23o 28' with the equator. It is the path which the sun appears to deseribe among the stars once a year....

## Mechanics, hydrostatics, pneumatics, optics

Ireland commissioners of nat. educ - 1861 - 310 pages
...A or B, fig. 76, works in what is called the nut or hollow screw. 243. Since the power describes a circle, the plane of which is perpendicular to the axis of the cylinder, it acts in a direction parallel to the bases of the inclined planes, of which the screw consists....

## The popular encyclopedia; or, 'Conversations Lexicon': [ed. by A. Whitelaw ...

Popular encyclopedia - 1874 - 530 pages
...seconds. EQUATOR By the celestial equator is understood that imaginary great circle in the heavens, the plane of which is perpendicular to the axis of the earth; it is everywhere 00" distant from the celestial l>oles, which coincide with the extremities of the...

## Elements of Astronomy

Robert Stawell Ball - 1880 - 488 pages
...construction as that already described. Attached to the axis, near each of the pivots, is a graduated circle, the plane of which is perpendicular to the axis of the pivots. One of these circles is shown in the figure. These circles are fixed to the axis, so that they...

## The Imperial Dictionary of the English Language: A Complete ..., Volume 2

John Ogilvie - 1883 - 714 pages
...from L. crquo. cequatum, to make equal.) 1. In outran, thai Imaginary great circle in the heavens, the plane of which is perpendicular to the axis of the earth. It is everywhere 90° distant from the celestial poles, which coincide with the extremities of the...

## The National Standard Encyclopedia: A Dictionary of Literature, the Sciences ...

1884 - 718 pages
...the motions of the planets. Equator, -kwa'ter. In Astron. that imaginary great circle in the heavens, the plane of which is perpendicular to the axis of the earth. It is everywhere 90° distant from tho celestial poles. Equatorial, -kwa-tó-'ri-al. An astronomical...

## A Short History of Astronomy

Arthur Berry - 1899 - 578 pages
...FGH 1 in each of its positions represents the equator of the earth, ie a great circle on the earth the plane of which is perpendicular to the axis of the earth and is consequently always parallel to the celestial equator. This circle is not in the plane of the...