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astronomical azimuth chron chronometer column contrary names Corr correct magnetic course corresponding course and distance deviation difference of latitude difference of longitude dist East enter the Traverse equation find the difference FIND THE LATITUDE Find the true given greater Green Greenwich date Greenwich mean havers haversine height hour angle Hourly diff Index error Inman left and diff LONGITUDE BY CHRONOMETER magnetic bearing meridian altitude miles diff Nautical Almanac noon observed altitude p.m. mean parallax Parallel Sailing pass the meridian plane sailing polar distance Pole R.A. mean sun remainder required the latitude right ascension semid semidiameter Sept September ship mean ship sails ship's head sidereal standard compass course subtract take the less take their difference Traverse Table triangle true altitude true amplitude true bearing true course variation Vers versine westerly zenith distance
Page 45 - WIND 0 Calm. 1 Light Air 2 Light Breeze 3 Gentle Breeze 4 Moderate Breeze 5 Fresh Breeze 6 Strong Breeze — 7 Moderate Gale 8 Fresh Gale 9 Strong Gale 10 Whole Gale...
Page 59 - To the hour angle thus found add the star's right ascension, and from the sum (increased if necessary by 24 hours) subtract the right ascension of the mean sun ; the result (rejecting 24 hours if greater than 24 hours) will be ship mean time.
Page 45 - Double/reefed topsails, jib, &c. Treble/reefed topsails &c. Close/reefed topsails and courses Or that with which she could scarcely bear close/reefed maintopsail reefed foresail.
Page 45 - Snow. t— Thunder. u — Ugly threatening appearance of the weather. v— Visibility of distant objects, whether the sky be cloudy or not. w — Wet dew. . — Under any letter, indicates an extraordinary degree.
Page 24 - ... except in certain positions, point to the true north, but at an angle to it, according to the needle's position on the earth's surface. This angle, which may have any value up to 180°, is the angle between the true and magnetic meridians, and is known as the 'Variation.' It is called easterly if the north end of the needle is drawn to the right of the true meridian, and westerly if drawn to the left. At those places where the true and magnetic meridians do coincide the variation is nothing....
Page 116 - The method of using them is as follows : From the observed altitude, when corrected for the error of the instrument, refraction, and dip of the horizon, subtract i'.
Page 48 - ... modes of reckoning time. ARTICLE XII. The civil day, which is that adopted for the usual purposes of business, begins at midnight, and ends at the midnight following ; it is divided into two parts of 12 hours each ; the first 12 are marked AM, signifying ante meridiem, ie before the meridian or noon; and the other 12 are marked PM, signifying post meridiem, ie after the meridian or noon.
Page xxv - For, the combination of an incident and a reflected wave sin a cos a —cos a sin a sin a cos a COS a...
Page 45 - Or that with which she could scarcely bear close/reefed maintopsail reefed foresail. Or that which would reduce her to storm staysails. Or that which no canvas could withstand. If the above mode were adopted, the state of the wind might be regularly marked, in a narrow column, on the log/board every hour. LETTERS to denote the State of the Weather b BLUE SKY; whether clear or hazy atmosphere. c CLOUDS; detached passing clouds, d DRIZZLING Rain, f FOGGY Thick fog.