The practical observer : Or, The new method of finding the latitude at sea, by taking two altitudes, either in the forenoon or afternoon. And also, the new method of finding the longitude at sea, by taking the distance of the moon from the sun, or a fixed Star, &c. Rendered easy to the meanest capacity. By J. Hamilton Moore, author of the practical navigator, and seaman's new daily assistant. To which is added, the new Solar tables. and table of natural sines, with the use of the quadrant and sextant.