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added angle Answer apparent altitude arch bearing called Cape centre chronometer circle Co-sec Co-sine Coast column compass contained Corr correction corresponding course daily degrees departure Diff difference of latitude directed Dist distance Ditto divided draw East equal Equation error EXAMPLE Extend feet figures give given greater Greenwich half Head height hence horizon horizontal parallax Island less Light logarithm longitude lower limb mean measure meridian method middle miles minutes moon moon's natural Nautical Almanac nearest noon North object observed opposite parallel passing planet Point proportional radius reduce remainder right ascension Rock Rules sails Secant seconds ship side sine South star Star's subtracted Sun's Sun's declination suppose Suvers Table taken Tang tangent true altitude variation Versed West
Página 20 - 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.
Página 16 - 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.
Página 159 - 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...
Página 9 - 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.
Página 15 - 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.
Página 231 - ... 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.
Página 20 - 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.
Página 52 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.