| 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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