Tables Requisite to be Used with The Nautical Ephemeris,: For Finding the Latitude and Longitude at Sea |
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Add aft Add bef afcenfion Afia India Afia Pacific Ocean Africa Almanac for Noon alſo Amer apparent altitude apparent diſtance Atlantic Ocean Beering's Str Cape Church 50 Co-fecant Co-fine Co-tang computed latitude computing the Latitude Corr correction difference Dift Europe England Europe France Europe Germany Europe Italy Europe Netherlands Europe Ruffia firſt fouth fubtracted fun's Houſe Ifle Iſland Iſle latitude by account Latitudes and Longitudes leſs Logarithmic Sines Longitudes of Places meridian meridional altitude moon Moon's Center moon's declination moon's horizontal parallax muſt N.cof N.fine Names of Places Nautical Almanac Noon at GREENWICH obſerved altitude Pacific Ocean proportional logarithm refraction Rifing right aſcenſion SCHOLIUM Secant ſecond ſhip Ship at Sea ſtands ſtar Star's Steeple 51 ſum ſun's Sun's declination TABLE VIII TABLE XIX TABLE XVI Tangent theſe true altitude true diſtance uſing Windmill Windmill 51 Zeeland
Popular passages
Page 50 - ... in the Ephemeris; the remainder will be the proportional logarithm of a portion of time to be. added to the hour answering to the nearest distance, to obtain the approximate Greenwich mean time corresponding to the given distance.
Page 34 - ... 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 5 - Almanac forNoon atGREENwicH, toany other Time under that Meridian ¡ or to Noon under any other Meridian. Add aft. N. Sub. b.ef. N. Sub. aft. N. Add bef. N. HM 7-4° HM
Page 23 - 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 1 - SuQ ; or Star; an additional dark Glafs, lighter than the common ones, to take off the Glare of the Moon's Light in obferving her...
Page 35 - Add the Difference of the two Numbers taken out of this Table, if the Apparent Argument.
Page 17 - ... 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 155 - For reducing the fun's right afcenfion 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...
Page 31 - ... confequently, if the obfervation be made in the forenoon, the time, thus found, muft be taken from 24 hours, and the remainder will be the apparent time from the noon of the preceding day. Example. On the 5th of March 1780, in the afternoon, in latitude 16° 24' north, and longitude 138" eaft, the altitude of the fun's lower limb was obferved to be 47° 8
Page 15 - Then, if the zenith diftance and declination be both north or both fouth, add them together ; but if one be north and the other fouth, fubtracT; the lefs from the greater, and the fum or difference will be the latitude, of the fame name with the greater.