The chronometer's companion, or, Perpetual solar almanack: to 1869 [&c.].G. Taylor, 1839 - 29 pagina's |
Veelvoorkomende woorden en zinsdelen
1.-Required A. M. apparent Aldebaran ANNUAL VARIATION Answer-In latitude Answer-In latitude 43 Answer-The apparent and mean Arcturus calculation in latitude chronometer showed 2h D's dec daily difference decl Diff Ditto at Greenwich EAST LONGITUDE error and rate EXAMPLE eye 18 feet eye 20 feet eye being 18 eye being 20 find the latitude full and change gives high water Hours of variation index error latitude 39 latitude 52 longitude 30 mh mh mh month Moon's Hor Nautical Almanac observed altitude observed meridian altitude P. M. civil P. M. Ditto past noon Pole Star proportional log QUESTIONS FOR EXERCISE required the apparent Required the equation required the lati required the latitude required the longitude Required the sun's ROYAL OBSERVATORY ship side column slow for Greenwich star's subtract sun's declination sun's lower limb sun's right ascension Table 17 TIDE TABLE true altitude tude VARIATION TO 1869 Zenith distance
Populaire passages
Pagina 12 - But if this sum exceed 12h. 24m. or 24h. 48m. subtract those times respectively from it, and the remainder will be the time of high water...
Pagina 16 - Table 5, and also for index error, if there be any ; then subtract the true altitude from 90°, and the remainder will be the zenith distance, to be called north...
Pagina 13 - ... but if one be north and the other south, their difference will be the latitude, and always of the same name with the greater term. Example 1. April 10th, 1825, in longitude 75? west, the meridian altitude of the sun's lower limb was 57?40'30" south, and the height of the observer's • See Note, page 624.
Pagina 24 - Multiply 3'55".91 by the number of days between the observations, and subtract the product from the time of the first observation ; divide the...
Pagina 13 - Contains the time of high water at full and change, together with the rise at spring and neap, at the most remarkable trading ports in Europe.