 | William Chauvenet - 1864 - 726 pages
...or that which it has when it reaches the eye, is that of a tangent to its curved path at this point; and the difference of the direction of the ray before entering the atmosphere and this last direction is called the astronomical refraction, or simply the refraction. Thus, Fig. 16, the ray Se from a star,... | |
 | William Chauvenet - 1864 - 720 pages
...that which it has when it reaches the eye, is that of a tangent to its curved path at this point ; and the difference of the direction of the ray before entering the atmosphere and this last direction is called the astronomical refraction, or simply the refraction. Thus, Fig. 16, the ray Se from a star,... | |
 | Nathaniel Bowditch - 1888 - 704 pages
...rarer into a continually increasing denser medium, becomes a curve, which is concave toward the earth. The last direction of the ray is that of a tangent...before entering the atmosphere and this last direction is called the refraction. Art. 249. To illustrate this, let MN (Fig. 62) repre sent the strata of the... | |
 | Great Britain. Army. Royal Engineers - 1893 - 348 pages
...SB a ray from the star S, entering the atmosphere at B, where it is beat into the curve BA, and as the last direction of the ray is that of a tangent to its curved path at the eye of the observer, the apparent direction of the star will be AS', and the... | |
 | George Albert Wentworth - 1895 - 436 pages
...the star will be seen in the direction OS' tangent to PO at 0, the last direction of the ray being that of a tangent to the curved path at the eye of the observer. These laws NAVIGATION. are here assumed. The facts and reasoning on which they depend belong to works... | |
 | Nathaniel Bowditch - 1906 - 670 pages
...continually increasing density becomes a curve, which is concave toward the earth. The last direction cf the ray is that of a tangent to the curved path at...and this last direction constitutes the refraction. 297. To illustrate this, consider the earth's atmosphere as shown in figure 37; let SK be a ray from... | |
 | Nathaniel Bowditch - 1916 - 912 pages
...medium into one continually increasing density becomes a curve, which is concave toward the earth. The last direction of the ray is that of a tangent...direction of the ray before entering the atmosphere »nd this last direction constitutes the refraction. 297. To illustrate this, consider the earth's... | |
 | John William Norie, J. W. Saul - 1917 - 642 pages
...that which it has when it reaches the eye, is that of a tangent to its curved path at this point ; and the difference of the direction of the ray before entering the atmosphere and this last direction is called simply the refraction, or occasionally the refraction in altitude. In Fig. 3, let AT represent... | |
 | Nathaniel Bowditch - 1920 - 840 pages
...continually increasing density becomes a curve, which is concave toward the earth. The last direction of tho ray is that of a tangent to the curved path at the...and this last direction constitutes the refraction. 297. To illustrate this, consider tho earth's atmosphere as shown in figure 44; let SB be a ray from... | |
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The last direction of the ray is that of a tangent to the curved path at the eye of the observer, and the difference of the direction of the ray before entering the atmosphere and this last direction constitutes the refraction. 