| Robert Gibson - Surveying - 1811 - 580 pages
...sum will be the log. sine of the true amplitude, to be reckoned from the east ia the morning, or the west in the afternoon, towards the north or south,...north or both south, their difference is the variation ; but it one be north and the other south, their sum is the variation ; and to know whether it be easterly... | |
| Robert Gibson - Surveying - 1814 - 558 pages
...suai will be the log. sine of the true amplitude, to be reckoned from the east in the morning, or the west in the afternoon, towards the north or south,...declination. 2. Then if the true and magnetic amplitudes, be brfth north or both south, their difference is the variation ; but if one be north and the other south,... | |
| Robert Gibson - Surveying - 1832 - 290 pages
...sum will be the log. sine of the true amplitude, to be reckoned from the east in the , morning or the west in the afternoon, towards the north or south,...north or both south their difference is the variation, but if one be north and the other south their sum is the variation ; and to know whether it be easterly... | |
| Robert Gibson - Surveying - 1833 - 436 pages
...variation of the compass by an amplitude. morning or the west in the afternoon, towards the north lor south. according to the declination. 2. Then if the...north or both south their difference is the variation, but if one be north and the other south their sum is the variation ; and to know whether it be easterly... | |
| John William Norie - 1840 - 184 pages
...stand the sun's true amplitude, which is to be reckoned from the east in the morning, and from the west in the afternoon, towards the north or south, according to the declination. NOTE. When the minutes of the latitude or declination are nearly 30, or half a degree, the mean of... | |
| Janet Taylor - Nautical astronomy - 1842 - 592 pages
...the logarithmic sine of the true amplitude, to be reckoned from the cast in the morning, or from the west in the afternoon, towards the north or south according to the declination. Now, if the true amplitude thus found, and the magnetic amplitude observed by the compass, he both... | |
| Alexander Baharie - 1844 - 218 pages
...azimuth. The true amplitude of a celestial object is reckoned from the east in the morning, and from the west in the afternoon,, towards the north or south, according to the declination. The true azimuth of a celestial object is reckoned from the south, if the observer be in north latitude,... | |
| Basil Jackson - Military reconnaissance - 1847 - 410 pages
...degrees and minutes between the true E. or W. and the magnetic is the variation of the needle. Observe, if the true and magnetic amplitudes be both north or both south, their difference is the variation ; but if one be north and the other south, their sum is the variation : and, to know whether it be... | |
| John William Norie - Nautical astronomy - 1852 - 844 pages
...will be the log. sine of the true amplitude*, to be reckoned from the east in the morning, or from the west in the afternoon, towards the north or south, according to the declination. 3. Then, if the true and magnetic amplitudes be both north, or both south, their difference is the... | |
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