 | 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... | |
 | 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.... | |
 | 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.... | |
 | 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... | |
 | 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... | |
 | 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... | |
 | 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... | |
 | 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... | |
 | 1901 - 532 pages
...corresponding celestial equator in the plane of the terrestrial, an 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 earth's... | |
 | Thomas Edward Finegan - 1922 - 560 pages
...Equinox . ing celestial equator in the plane of the terrestrial, an 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... | |
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An oblique equator is a great circle the plane of which is perpendicular to the axis of an oblique projection. 
