The New American Practical Navigator: Being an Epitome of Navigation; Containing All the Tables Necessary to be Used with the Nautical Almanac, in Determining the Latitude, and the Longitude by Lunar Observations ... : With an Appendix Containing Methods of Calculating Eclipses of the Sun and Moon ...Edmund M. Blunt, Proprietor and author of the American coast pilot ; John Gray & Company, Print., 1826 - 617 σελίδες |
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Σελίδα 23
... course of this work ; but it will be unnecessary to enter into an explanation of its use in calculating the common problems of Nautical Astronomy , as it is much more accurate to perform those calculations by logarithms . ON THE SLIDING ...
... course of this work ; but it will be unnecessary to enter into an explanation of its use in calculating the common problems of Nautical Astronomy , as it is much more accurate to perform those calculations by logarithms . ON THE SLIDING ...
Σελίδα 24
... course the second and fourth terms alike ; then bring the first term of the analogy on the fixed part , against the second term on the slider , and against the third term on the fixed part will be found the fourth term on the slider ...
... course the second and fourth terms alike ; then bring the first term of the analogy on the fixed part , against the second term on the slider , and against the third term on the fixed part will be found the fourth term on the slider ...
Σελίδα 25
... course sailed 1 point , and the distance 85 miles- required the difference of Latitude and Departure ? By Case 1st of Plane Sailing , we have these canons : Radius ( 8 points ) : Distance ( 85 ) :: Sine . Co. Course ( 7 points ) : Diff ...
... course sailed 1 point , and the distance 85 miles- required the difference of Latitude and Departure ? By Case 1st of Plane Sailing , we have these canons : Radius ( 8 points ) : Distance ( 85 ) :: Sine . Co. Course ( 7 points ) : Diff ...
Σελίδα 44
... course , the cause of their rising and setting , of day and night . The axis of the earth is inclined about 23 ° 28 ' to the plane of its orbit , and keeps nearly in a direction parallel to itself , throughout its annual course , which ...
... course , the cause of their rising and setting , of day and night . The axis of the earth is inclined about 23 ° 28 ' to the plane of its orbit , and keeps nearly in a direction parallel to itself , throughout its annual course , which ...
Σελίδα 48
... course of a year . The ecliptic and equator , being great circles , must bisect each other , and their angle of inclination is called the obliquity of the ecliptic ; and the points where they intersect are called the equinoctial points ...
... course of a year . The ecliptic and equator , being great circles , must bisect each other , and their angle of inclination is called the obliquity of the ecliptic ; and the points where they intersect are called the equinoctial points ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
anchor angular distance apparent altitude arch azimuth bearing calculation central index centre chronometer circle co-sec co-sine column compass corresponding course sailed degrees diameter Diff difference of latitude difference of longitude Dist divided draw elapsed equal equator error EXAMPLE feet Funchal given gives Greenwich half sum horizon glass hour angle hypotenuse instrument latitude and departure line of numbers logarithm mean meridian altitude method middle latitude miles minutes moon moon's multiplied Nautical Almanac nearly noon object observed altitude obtained parallax parallel passing the meridian perpendicular Plane Sailing points poles quadrant radius 90 refraction right ascension rule sea account secant semi-diameter sextant ship ship's side sine square star subtracted sun's declination sun's lower limb Suppose taken tangent telescope tion TRAVERSE TABLE triangle true altitude true distance tude variation watch wind zenith distance
Δημοφιλή αποσπάσματα
Σελίδα 10 - 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.
Σελίδα 5 - In a right triangle, the side opposite the right angle is called the hypotenuse, and the other two sides the legs.
Σελίδα 187 - If the vessel be double-decked, take the length thereof from the fore part of the main stem, to the after part of the stern post, above the upper deck"; the breadth thereof at the broadest part above the main wales...
Σελίδα 28 - To find the logarithm of a vulgar fraction. RULE. Subtract the logarithm of the denominator from the logarithm of the numerator...
Σελίδα 240 - Sear up, or bear away, is to change the course of a ship, in order to make her run before the wind...
Σελίδα 13 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Σελίδα 205 - The cause of the tides is the unequal attraction of the sun and moon upon different parts of the earth. For they attract the parts of the earth's surface nearest to them, with a greater force than they do its centre : and attract the centre more than they do the opposite surface. To restore this equilibrium the waters take a spheroidal figure, whose longer axis is directed towards the attracting luminary.
Σελίδα 187 - ... take the depth from the under side of the deck plank to the ceiling in the hold, then multiply and divide as aforesaid, and the quotient shall be deemed the tonnage.
Σελίδα 6 - CO-SINE of an arch is the sine of the complement of that arch, or of what that arch wants of a quadrant ; thus AH being a quadrant, the arch SH is the complement of the arch AS ; SZ is the sine of the arch SH, or the co-sine of the arch AS. XXI. The VERSED SINE of an arch is that part of the diameter...
Σελίδα 91 - The index and horizon glasses must be perpendicular to the plane of the instrument, and their planes parallel to each other, when the index division of the vernier is at 0° on the arc ; and the optical axis of the telescope must be parallel to the plane of the instrument. We shall speak separately of each of these adjustments.