The Nautical Almanac and Astronomical Ephemeris for the Year ...order of the Lords Commissioners of the Admiralty, 1771 |
Other editions - View all
Common terms and phrases
12 Hours 21 Hours 9 Hours Aftronomical Aldeba alfo Antares Aquarii Aquile Arietis Cancri Capri Center from Stars Ceti clination Clock computed corni Cygni D's Age D's Center Days H. M. S. Days Declination diff Diſtance Distances of D's Draconis Eaft Eclipfes Emerfions Ephemeris fame fecond Differences fettled fhall firft Differences firſt folar Fomal fubftract fuch Gemino Geocen gitude Greenwich H. M. S. Days H. M. S. Half Interval Heliocen Immerfions Increaſe Latitude Leonis Libræ Logarithm M.JH Merid Midn Month Moon's Lon NAUTICAL ALMANAC Noon O's Long Obfervations Ophiuchi paffing the Meridian Parallax Pegafi Perfei Perfons Phafes Pifcium Planets Pollux Proport publiſhed Regulus requifite Right Afc right Afcenfion Sagittarii SATELLITES of JUPITER Scorpii Semid Semidiameter Spica Stars Names Sun's Longitude Sun's Sun's Sunday after Trinity Tables Tauri thefe theſe titude TOBIA MAYER tric Lon tude ufeful uſeful Virginis Week weft ΙΟ
Popular passages
Page 151 - Time found compared with that shown by the Watch ; -the Difference will be the Longitude in Time from the Meridian by which the Watch was set, as near as the Going of the Watch can be depended upon.
Page 145 - Day are the same in this Method as in the civil Account at Noon, and from Noon till Midnight; but from Midnight till Noon they differ; for...
Page 164 - Obfcrvation of her Diftance from the Sun or a Star, fuppofing it . was neglected to be or could not be obferved properly; which latter Cafe may fometimes happen in the Night, though I think but rarely ; the utmoft Accuracy not being required for the Calculations of Refraction and Parallax.
Page 164 - Longitude may be inferred, though no Altitude of the Sun or a Star -was taken for regulating the Time. See British Mariner's Guide, Page 61, and Mr. Edwards'* 5th Problem annexed to the Nautical Almanac of 1781, Page 10.
Page 150 - Timp from an obferved Altitude of the Sun at a Diftance from the Meridian, the Latitude being given ; or to compute the Time of the...
Page 157 - S. If thefe Determinations of the Situations of the Cape Point and Cape Falfo are in any refpefl uncertain, it arifes from the Imperfection of the Charts I was obliged to make ufe of, in reducing the Longitude and Latitude from the Cape Town to the Two mentioned Points: For from the near Agreement of the Abbeé delà Caille's Obfcrvations with thofe cf Meffrs.
Page 166 - Diltances obf.rvcd at Sea, will be ihewn hereafter in its proper Order, in the Differtation explaining the Method of computing the Longitude at Sea by the Help of the Ephemeris.