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### Innhold

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### Vanlige uttrykk og setninger

angle Answer Apparent distance arch Cape centre Chro chronometer Co-secant Co-sine Co-tan compass Corr corresponding course and distance difference of latitude difference of longitude Dist Dep Ditto East Equation Example extent will reach feet given Greenwich mean hence horizon index error Lat Dist Latitude and Departure line of numbers line of sines LOGARITHMIC SINES meridian altitude meridian of Greenwich middle latitude miles moon Moon's apparent altitude Moon's horizontal parallax natural versed sine Nautical Almanac nearest nonius noon observed altitude observer's eye opposite parallel Parallel Sailing passing the meridian perpendicular planet points polar distance Porto Santo prime vertical radius refraction remainder right ascension sails Secant seconds semidiameter sextant shewed ship ship's side column star subtracted Sun's declination sun's lower limb Sun's true taken Tang tangent true altitude true distance true longitude variation West zenith distance

### Populære avsnitt

Side 18 - A circle is a plane figure bounded by a curved line called the circumference, every point of which is equally distant from a point within called the center, Fig.

Side 15 - Multiply the index of the quantity by the index of the power to which it is to be raised, and the result will be the power required.

Side 14 - DIVISION BY LOGARITHMS. RULE. From the logarithm of the dividend subtract the logarithm of the divisor, and the number answering to the remainder will be the quotient required.

Side 157 - Astronomers, with a view of obtaining a convenient and uniform measure of time, have recourse to a mean solar day, the length of which is equal to the mean or average of all the apparent solar days in a year. An imaginary Sun, called the mean Sun...

Side 3 - LV. contains the times of high water on the full and change of the moon, with the vertical rise of the tide, at many ports, harbors.

Side 13 - Consequently, when the first three terms of a proportion are given, the fourth is found by multiplying the second and third terms together, and dividing the product by the first term.

Side 229 - ... will be double the altitude of the sun's limb above the horizontal plane ; to the half of which, if the semidiameter, refraction, and parallax be applied, the result will be the true altitude of the centre.

Side 18 - For the purpose of measuring angles, the circumference is divided into 360 equal parts, called degrees ; each degree into 60 equal parts, called minutes ; each minute into 60 equal parts called seconds.

Side 50 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.

Side 35 - ... division. Or the extent from any division to another on the line of meridional parts, applied to the line of equal parts, will give the meridional difference of latitude between the two places denoted by the divisions.