The Projection And Calculation of the Sphere for Young Sea Officers Being a Comp
The Projection And Calculation of the Sphere for Young Sea Officers Being a Comp
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To measure the angle ZaR. Having found the pole of ZaX (by Prob. VII. ) to be at p, and the pole of HaR to be akp, join ap and produce 48 NAUTICAL ASTRONOMY.
it to b, and join ap f and produce it to c, and the distance be measured on the scale of chords (or 68) will be the measure of the angle ZaE or HaX.
60. It must be remembered that the pole of a right circle is always at the primitive : thus the pole of Z X is at H or E (being at a distance of 90), and the pole of HE is at Z or X.
N. B. The... right circle appears as a diameter in the stereographic projection.
CONSTRUCTION OP SPHERIC TRIANGLES.
61. In proceeding to the construction of spheric triangles the navigator must bear in mind that it is convenient to make arcs of latitude, declination, altitude, &c. , to occupy the same relative positions in the sphere that is to say, latitude is always on the primitive, &c. , or in other words, he had better use a right sphere, as above, instead of an oblique sphere.
Declination is always a small circle parallel to the equator.
What to read after The Projection And Calculation of the Sphere for Young Sea Officers Being a Comp?
You can find similar books in the "Read Also" column, or choose other free books by S. M. Saxby to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
To measure the angle ZaR. Having found the pole of ZaX (by Prob. VII. ) to be at p, and the pole of HaR to be akp, join ap and produce 48 NAUTICAL ASTRONOMY.
it to b, and join ap f and produce it to c, and the distance be measured on the scale of chords (or 68) will be the measure of the angle ZaE or HaX.
60. It must be remembered that the pole of a right circle is always at the primitive : thus the pole of Z X is at H or E (being at a distance of 90), and the pole of HE is at Z or X.
N. B. The... right circle appears as a diameter in the stereographic projection.
CONSTRUCTION OP SPHERIC TRIANGLES.
61. In proceeding to the construction of spheric triangles the navigator must bear in mind that it is convenient to make arcs of latitude, declination, altitude, &c. , to occupy the same relative positions in the sphere that is to say, latitude is always on the primitive, &c. , or in other words, he had better use a right sphere, as above, instead of an oblique sphere.
Declination is always a small circle parallel to the equator.
What to read after The Projection And Calculation of the Sphere for Young Sea Officers Being a Comp?
You can find similar books in the "Read Also" column, or choose other free books by S. M. Saxby to read onlineMoreLess
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