This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ...Right ascension similarly corresponds to longitude; and for the beginning point of right ascensions on the sky there is a "celestial Greenwich," which is called the "vernal equinox." After this brief digression into astronomy, we return to our subject. We have seen (p. 82) that observations of the sun will tell us only ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ...Right ascension similarly corresponds to longitude; and for the beginning point of right ascensions on the sky there is a "celestial Greenwich," which is called the "vernal equinox." After this brief digression into astronomy, we return to our subject. We have seen (p. 82) that observations of the sun will tell us only apparent solar time, because it is only the visible sun that we can observe. If the observations are made.upon a star, the kind of time is different from any so far mentioned. It is called "sidereal time," or star time. It is always possible to change mean solar time into sidereal time, and vice versa, by a simple process of calculation; but the only change of this kind required in navigation is the transformation of G. M. T. into Greenwich sidereal time. To make this transformation, we have only to take from the almanac, for the given G. M. T., the R. A. of the mean sun, and then to add it to the given G. M. T. Thus, to find the Greenwich sidereal time corresponding to Dec. 29, 22 34TM 40.4, G. M. T., we have already found (p. 84) that the R. A. of the mean sun = 18 33" 11.3 To this must be added the given G. M. T. = 22 34 40.4 Sum = corresponding Greenwich sidereal time = 1717m51.7 1 The number of hours was here really 41: but whenever it is CHAPTER VIII OLDER NAVIGATION METHODS We shall now explain in detail certain standard methods of determining a ship's latitude and longitude by means of sextant observations. An understanding of these methods is essential to a proper comprehension of the newer navigational processes to be described later; and the older methods are in fact still very widely used at sea, although most recent authorities believe they should be rejected in favor of the newer procedure. The...
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