| Astronomy - 1806
...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 - Trigonometry - 1851 - 372 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
...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.... | |
| 1874
...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... | |
| Sir Robert Stawell Ball - Astronomy - 1880 - 459 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 - Encyclopedias and dictionaries - 1883
...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... | |
| Reference books - 1884 - 698 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 - Astronomy - 1899 - 440 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... | |
| Ainsworth Rand Spofford, Charles Annandale - Encyclopedias and dictionaries - 1901
...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 - Encyclopedias and dictionaries - 1922
...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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