 | sir John Frederick W. Herschel (1st bart.) - 1833 - 500 pages
...directions than those at a high alIitude. 3dly. The rate of its increase is nearly in proportion to the tangent of the apparent angular distance of the object from the zenith. But this rule, which is not far from the truth, at moderate zenith distances, ceases to give correct... | |
 | John Frederick William Herschel - 1834 - 406 pages
...directions than those at a high altitude. 3dly. The rate of its increase is nearly in proportion to the tangent of the apparent angular distance of the object from the zenith. But this rule, which is not far from the truth, at moderate zenith distances, ceases togive correct... | |
 | Edward Charles Frome - 1840 - 232 pages
...operation, by the use of any of the numerous tables of refraction ; that by Dr. Young, being given as table 4 in this volume. The rate of the increase of...irregularly, being at the horizon as much as 33', or more than the diameter of the sun or moon. The next correction is for parallax, the explanation... | |
 | John Frederick William Herschel - 1849 - 672 pages
...true directions than those at high altitude. 3dly. The rate of its increase is nearly in proportion to the tangent of the apparent angular distance of the object from the zenith. But this rule, which is not far from the truth, at moderate zenith distances, ceases to give correct... | |
 | George Frederick Chambers - 1867 - 888 pages
...increases to no less than 33'. The rate of the increase at high altitudes is nearly in proportion to the tangent of the apparent angular distance of the object from the zenith ; but in the vicinity b Since the barometer rises with an causes a decrease of density, it follows... | |
 | George Frederick Chambers - 1877 - 968 pages
...increases to no less than 35'. The rate of the increase at high altitudes is nearly in proportion to the tangent of the apparent angular distance of the object from the zenith ; but in the vicinity of the horizon this rule ceases to hold good, and the law becomes much more complicated... | |
 | George Frederick Chambers - 1889 - 736 pages
...horizon increases to nearly 35'. The rate of the increase at high altitudes is nearly in proportion to the tangent of the apparent angular distance of the object from the zenith ; but in the vicinity of the horizon this rule ceases to hold good, and the law becomes much more complicated... | |
 | John Thornton (M.A.) - 1890 - 372 pages
...directions than those at a high altitude. ' (3) The rate of its increase is nearly in proportion to the tangent of the apparent angular distance of the object from the zenith. But this rule, which is not far from the truth at moderate zenith distances, ceases to give correct... | |
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Objects near the horizon appear more elevated by it above their true directions than those at a high altitude. 3dly. The rate of its increase is nearly in proportion to the tangent of the apparent angular distance of the object from the zenith. But this... 