The Nautical Almanac and Astronomical Ephemeris for the Year ...order of the Lords Commissioners of the Admiralty, 1824 |
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Common terms and phrases
24 JUPITER Aldebaran Altitude Antares Aquarii Aquila Arietis Astronomical Board of Longitude Calculations Commissioners corrected D. M. S. DISTANCES D. M. S. III D. M. S. Midnight D. M. S. XVIII D. M. S. XXI D's Node Days Noon Diff Emersions Ephemeris Equation equinox February 9 Fomalhaut further enacted Greenwich H GEORGIAN h SATURN H. M. S. Days Heliocentric Immersions Interval July Longitude at Sea Lord High Admiral Majesty mean noon Mean Place Midn Month MoON's Centre MOON'S Longitude MOON'S Right Ascension MOON'S Semidiameter Motion Nautical Almanac Nearest Approach Northern Pole Number observed Order in Council Pacific Oceans Parallax passing Merid passing the Meridian Pegasi Person or Persons Piscium PLANETS Pollux PRINCIPAL FIXED STARS Proportional Logarithm Regulus remarkable Days Rewards SATELLITES OF JUPITER second Difference Semi Semidiam Sidereal Spica STARS EAST STARS WEST subtracted Tauri TRUE PLACES vernal equinox
Popular passages
Page xiii - ... extend, or be held or deemed to extend, to revive any former Acts or Parts of Acts which by the said recited Act of the Fiftyeighth Year of His late Majesty are repealed : Provided also, that nothing herein contained shall extend to abrogate or make void any Enactment now in force for the Payment to the Commander or Commanders, Officers, Seamen, and Marines, of any Ship or Ships of His Majesty, or to the Owner or Owners of any Ship or Vessel belonging to His Majesty's Subjects, of any Reward...
Page xxi - An Act for more effectually discovering the longitude at sea, and encouraging attempts to find a northern passage between the Atlantic and Pacific Oceans, and to approach the North Pole.
Page 200 - Diftance ; it is alfo neceflary to calculate the apparent Time from an obferved Altitude of the Sun at a Diftance from the Meridian, the Latitude being given ; or to compute the Time of the Sun's...
Page 202 - Ratio of 365 to 366, if great precision is required. From the Time of the Sun's Semidiameter passing the Meridian may also be found the Time of its passing the horizontal or Vertical Wire of a Quadrant or Sextant, which on some Occasions may have its Use. The Semidiameter of the Sun is necessary to reduce the observed Altitude of his upper or Lower Limb to that of the Centre ; also to reduce the observed Distance of the Moon's nearest Limb from the Sun's nearest Limb to the Distance of the Centres....
Page 200 - For this Purpose the Sun's right Ascension at the preceding Noon, together with the increase of right Ascension from Noon, must be added to the apparent Time of the Phenomenon set down in the Ephemeris.
Page 203 - It was hoped that some Means might be found of using proper Telescopes on Shipboard to observe these Eclipses : and could this be effected, it would be of great service in ascertaining the Longitude of a Ship from time to time. In my voyage to Barbadoes, under the Directions of the COMMISSIONERS OF LONGITUDE, in 1763, I made a full trial of the late Mr.
Page 200 - Time serves also to compute the apparent Time of a known Star passing the Meridian : thus, subtract the Sun's right Ascension in Time at Noon from the Star's right Ascension in Time, the remainder is the apparent Time of the Star's passing the Meridian nearly; from which the proportional Part of the daily Increase...
Page 3 - Add together the proportional logarithm of the Moon's reduced horizontal parallax, the logarithmic secant of the star's altitude, and the logarithmic cosecant of the complementary angle; the sum will be the proportional logarithm of the orbital parallax, which must have the same sign as the complementary angle. To this logarithm add the logarithmic tangent of the complementary angle; the sum will be the proportional logarithm of the perpendicular parallax, which must have the contrary sign to that...
Page 203 - The Eclipses of Jupiter's Satellites are observed by Astronomers at Land, as well in order to provide Materials for improving the Theories and Tables of their Motions, as for the sake of comparison with the corresponding Observations which may be made by Persons in different Parts of the Globe, whereby the Longitude of such Places will be accurately ascertained.