New American Practical NavigatorU.S. Government Printing Office, 1880 |
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Side xv
... measuring the distance of the moon from a fixed star not marked in the Nautical Almanac Problem XVI . To find the longitude of a place by the moon's passage over the meridian ... 427 .... 429 Problem XVII . Given the latitude of the ...
... measuring the distance of the moon from a fixed star not marked in the Nautical Almanac Problem XVI . To find the longitude of a place by the moon's passage over the meridian ... 427 .... 429 Problem XVII . Given the latitude of the ...
Side 5
... measured by the arc of a circle comprehended between the two legs that form the angle ; the centre of the circle being the angular point , and the whole circumference considered as equal to 360 ° . Thus the angle A is measured by the ...
... measured by the arc of a circle comprehended between the two legs that form the angle ; the centre of the circle being the angular point , and the whole circumference considered as equal to 360 ° . Thus the angle A is measured by the ...
Side 9
... measured by half the arc it subtends . For an angle at the centre , standing on the same arc , is measured by the whole arc ( by Art . 11 ) ; but since an angle at the centre is double that at the circumference ( Art . 40 ) , it is ...
... measured by half the arc it subtends . For an angle at the centre , standing on the same arc , is measured by the whole arc ( by Art . 11 ) ; but since an angle at the centre is double that at the circumference ( Art . 40 ) , it is ...
Side 13
... measured by the arc BA ) , and the angle CBA is also 60 ° ( being measured by half the arc AD = 120 ° , by Art . 40 ) ; therefore ( by Art . 39 ) CA = AB ; that is , the chord of 60 ° is equal to the radius . The four following ...
... measured by the arc BA ) , and the angle CBA is also 60 ° ( being measured by half the arc AD = 120 ° , by Art . 40 ) ; therefore ( by Art . 39 ) CA = AB ; that is , the chord of 60 ° is equal to the radius . The four following ...
Side 15
... measuring it on the line of chords , as is evident . PROBLEM VII . To bisect a given arc of a circle , AB , whose centre is C. Take in your compasses any extent greater than the half of AB , and , with one foot in A , describe an arc ...
... measuring it on the line of chords , as is evident . PROBLEM VII . To bisect a given arc of a circle , AB , whose centre is C. Take in your compasses any extent greater than the half of AB , and , with one foot in A , describe an arc ...
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American Practical Navigator: An Epitome of Navigation : Originally by ... Uten tilgangsbegrensning - 1962 |
Vanlige uttrykk og setninger
angle apparent altitude azimuth bearing calculated Cape centre chord chronometer circle column compass Corr corresponding Cosec courses sailed degrees diameter diff difference of latitude difference of longitude Dist draw east equal equator error EXAMPLE extent will reach feet find the course find the difference given Greenwich Half-sum horizon glass horizontal parallax hour angle hypotenuse instrument latitude and departure Latitude Sailing line of numbers line of sines logarithm lower limb lunitidal interval mean meridian altitude method middle latitude miles moon moon's multiplied Nautical Almanac nearly noon object observed altitude parallel Parallel Sailing perpendicular Plane Sailing points polar distance quadrant radius 90 refraction right ascension screw sea account secant semidiameter sextant ship side sine course star subtracted sun's declination Suppose telescope transit triangle true altitude true distance true longitude variation wires
Populære avsnitt
Side 11 - The angle in a semicircle is a right angle ; the angle in a segment greater than a semicircle is less than a right angle ; and the angle in a segment less than a semicircle is greater than a right angle.
Side 15 - In any plane triangle, as the sum of the sides about the vertical angle is to their difference, so is the tangent of half the sum of the angles at the base to the tangent of half their difference.
Side 15 - In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference. By Theorem II. we have a : b : : sin. A : sin. B.
Side 6 - A plane rectilineal angle is the inclination of two straight lines to one another, which meet together, but are not in the same straight line.
Side 254 - Emersion (Em.) the instant of its reappearance at coming out of the shadow. They generally happen when the Satellite is apparently at some distance from the body of Jupiter, except near the opposition of Jupiter to the Sun, when the eclipse takes place near to the body of the planet.
Side 7 - In a right triangle, the side opposite the right angle is called the hypotenuse, and the other two sides the legs.
Side 233 - ... distance, to obtain the approximate Greenwich mean time corresponding to the given distance. If the distance between the Moon and a Star increased or decreased uniformly, the Greenwich...
Side 126 - ... to the depth of 80 or 100 fathoms ; then heave the log, and the number of knots run out in half a minute will be the miles the current sets per hour, and the bearing of the log will show the set of it. There is a very remarkable current, called the GULF STREAM, which sets in a north-east direction along the coast of America, from Cape Florida towards the Isle of Sables...
Side 148 - ... placed by the maker equidistant from each other and parallel to the middle one — therefore, when the middle one is adjusted, the others are so too ; he also places the two transverse wires at right angles to the vertical middle wire. These adjustments are always performed by the maker, and but little liable to derangement. When, however, they happen to get out of order, and the observer wishes to correct them, it is done by loosening the screws which hold the eye-end of the telescope in its...
Side 136 - ... to make the objects appear on the other wire ; if the contact still remains perfect, the axis of the telescope is in proper adjustment ; if not, it must be altered by moving the two screws which fasten, to the up-and-down piece, the collar into which the telescope screws. This adjustment is not very liable to be deranged.