 | John Bonnycastle - 1806 - 464 pages
...equinoctial points ; and the solstitial colure is a meridian passing through the solsticial points. Azimuth, or vertical circles, are great circles passing through the zenith and nadir of any place, and cutting the horizon at right angles. The prime vertical, or six o'clock hour line,... | |
 | Thomas Keith - 1810 - 478 pages
...the feet, and is diametrically opposite to the zenith j being the depressed pole of the horizon. (M) Azimuth, or vertical circles are great circles passing through the zenith and nadir. They cut the horizon at right ' angles. The altitudes of the heavenly bodies are measured on these... | |
 | G. Rubie - 1830 - 204 pages
...diametrically opposite to the Zenith ; consequently it must be in the depressed pole of the horizon. Azimuth or Vertical Circles are great circles passing through the Zenith and Nadir. An Arc of a Circle is any part of a circle. An imaginary line supposed to be drawn from the zenith... | |
 | Thomas Keith - 1839 - 498 pages
...spectator, and is diametrically opposite to the zenith ; being the depressed pole of the horizon. (521) Azimuth or vertical circles, are great circles passing through the zenith and nadir. They cut the horizon at right angles. The altitudes of the heavenly bodies are measured on these circles.... | |
 | Alexander Baharie - 1844 - 218 pages
...head ; and the nadir is a point directly under the feet, and is diametrically opposite to the zenith. Azimuth, or vertical circles, are great circles passing through the zenith and nadir ; they cut the horizon at right angles. The prime vertical is that azimuth circle which passes through... | |
 | John William Norie - 1852 - 844 pages
...that point immediately under it. Hence the zenith and nadir are the poles of the rational horizon. Azimuth or vertical circles, are great circles passing through the zenith and nadir, and therefore intersect the horizon at right angles. That vertical . circle which passes through the... | |
 | Thomas Turner Tate - 1855 - 442 pages
...the heavenly bodies, &c., and the lower divisions are used for finding the duration of twilight. 27. AZIMUTH or VERTICAL CIRCLES, are great circles passing through the zenith and nadir points, cutting the horizon at right angles. The altitudes of the heavenly bodies are measured on these... | |
 | Edward Albert Bowser - 1892 - 392 pages
...which is exactly overhead ; the other pole of the horizon directly underneath is called the nadir. Vertical circles are great circles passing through the zenith and nadir. The two principal vertical circles are the celestial meridian and the prime vertical. The celestial meridian... | |
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Azimuth, or vertical circles are great circles passing through the zenith and nadir. They cut the horizon at right ' angles. The altitudes of the heavenly bodies are measured on these circles. 