 | 1821 - 708 Seiten
...observed and true amplitudes be both north or both south, their difference will be the variation ; but if one be north and the other south, their sum will be the variation. If the true and observed azimuths be both east or both west, their differ»nce will be the... | |
 | Edward Riddle - 1824 - 572 Seiten
...amplitude and that by the compass be both north or both south, their difference will be the variation ; but if one be north and the other south, their sum will be the variation, easterly when the true amplitude is to the right, and westerly when it is to the left of... | |
 | David Thomson - 1831 - 316 Seiten
...this, and the right ascension of the given object, will be its horary distance from the meridian. 9,. 1f the Latitude of the place, and the Declination...Logarithm of the horary angle of the object, Table X11L, the Logarithms of the Latitude and Declination used as Half Sums, in Table X1L, and the Logarithm... | |
 | John William Norie - 1840 - 184 Seiten
...amplitude by a compass, if they be both north, or both south, their difference will be the variation ; but if one be north, and the other south, their sum will be the variation ; and to know whether it be easterly or westerly, suppose the observer looking towards that... | |
 | Brothers of the Christian schools of Ireland - 1843 - 120 Seiten
...the latitudes of both places; if both be north, or both south, their difference will be the answer; but if one be north and the other south, their sum will be the answer. Exercise.— What is the difference of lat. between Philadelphia and Petersburg? Ans., 20 degrees.... | |
 | Alexander Baharie - 1844 - 218 Seiten
...true and magnetic amplitudes be both north or both south, their difference will be the variation ; but if one be north and the other south, their sum will be the variation. Then, if the true amplitude be to the right of the magnetic, the variation will be east... | |
 | Brothers of the Christian schools of Ireland - 1845 - 138 Seiten
...the latitudes of both places ; if both be north, or both south, their difference will be the answer ; but if one be north and the other south, their sum will be the answer. Exercise. — What is the difference of lat. between Philadelphia and Petersburg? Ana., 20°.... | |
 | William Somerville Orr - 1856 - 622 Seiten
...amplitude, and that by compass, be both north or both south, their difference will be the variation, but if one be north and the other south, their sum will be the variation, easterly when the true amplitude is to the right, and westerly whin it is to the left of... | |
 | Christian Brothers - 1904 - 226 Seiten
...the latitudes of both places ; if both be north or both south, their difference will be the answer; but if one be north and the other south, their sum will be the answer. Exercise. — What is the difference of lat. between Philadelphia and St. Petersburg? Ana.,... | |
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Rule. — Find the latitudes of both places; if both be north, or both south, their difference will be the answer; but if one be north and the other south, their sum will be the answer. Exercise.— What is the difference of lat. between Philadelphia... 