Tables Requisite to be Used with The Nautical Ephemeris: For Finding the Latitude and Longitude at Sea

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T. Bensley, sold by J. Payne, 1802 - Ephemerides - 206 pages
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Page 159 - Almanack for 4--"' for noon and midnight at Greenwich, to any other time under that meridian, or to noon or midnight under any cihtr.
Page 25 - XXIII., and, from the column of log. rising, take out the logarithm corresponding, from which logarithm subtract the log. ratio ; the remainder will be the logarithm of a natural number, which, being found in Table...
Page 19 - ... time. The difference between these times will be the time from noon when the greater altitude was taken. With this time enter Table XXIII., and, from the column of log.
Page 157 - For reducing the fun's right afcci fion in time, as given in the Nautical Almanack for noon at Greenwich, to any other time under that meridian, or to noon under any other meridian. • We are here to'd, that the new tables, with their explanation and nfe, were drawn up by W.
Page 27 - ... one o'clock. If one be taken in the forenoon, and the other in the afternoon, the morning one muft not be before half paft ten, and the interval between them muft not exceed two hours and a quarter, Remark X.
Page 36 - ... centre. RULE. With the apparent time from noon, enter Table XXIII. and from the column of rising take out the logarithm corresponding, to which add the log. co-sine of the latitude, and the log. co-sine of the sun's declination ; their sum, rejecting 20 in the index, will be the logarithm of a natural number, which being subtracted from the natural co-sine of the sum of the declination and latitude, when they...
Page 171 - LYNN, Norfolk. See KING'S LYNN. LYNN, T. Supplement to the Horary Tables, for finding the time by inspection, to facilitate the operations for obtaining the latitude and longitude at sea, etc. Stereotype edition.
Page 27 - If one observation be in the forenoon, and the other in the afternoon, the interval...
Page 57 - FOR FACILITATING THE SOLUTION OF A VERY USEFUL PROBLEM, FOR FINDING THE LATITUDE OF A SHIP AT SEA, HAVING THE LATITUDE BY ACCOUNT, TWO OBSERVED ALTITUDES OF THE SUN, THE TIME ELAPSED BETWEEN THE OBSERVATIONS MEASURED BY A COMMON WATCH, AND THE DECLINATION OF THESUN; WITH PRECEPTS AND EXAMPLES: LONDON: PRINTED BY W.
Page 3 - The observer must be furnished with a good Hadley's quadrant, and a watch that can be depended upon for keeping time within a minute for six hours. But it will be more convenient if the instrument be made a sextant, in which case it will measure 120', for the sake of observing the moon's distance from the sun, for two or three days after the first and before the last quarter. The instrument...

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