Nautical science in its relation to practical navigation, together with a study of the tides and tidal currents (1910)
Poor, Charles Lane, 1866- · New York, London, G. P. Putnam's sons · leaf 190
Finding One's Position at Sea 157 observer that he was at some point on this circle,— neither inside nor outside of it, but on it; and this … 70 10 0 10 Fig. II. A Circle of Position is the sum total that can be derived from the measured altitude. Mathematical calculation is no use, logarithms are of no avail, the measured altitude tells the observer that he is on this circle, but not upon any definite portion of it. To find
Nautical astronomy
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