Elementary Treatise On Navigation And Nautical Astronomy
Elementary Treatise On Navigation And Nautical Astronomy
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Th t ' sin parallax _ E smSAC~~d' sin(90 + A)~ eP or (2) sin (parallax) = ^ sin (90 + h)=^ cos h.
CL Cv Suppose the celestial body to be in the horizon at B ; then 7-> sin parallax = sin ABC= d In this case the parallax is called the horizontal parallax ; that is, 7~> (3) sin horizontal parallax = a 7~> Substituting in (2) this equivalent of, we have a (4) sin parallax = sin (horizontal parallax) cos h.
Since parallax and horizontal parallax are always small angles (except in the case of the mo...on), we may substitute for the sines the measures of these angles, at any altitude, and (4) becomes parallax = horizontal parallax x cos h.
Both from the equation and from the figure it is evident that parallax is greatest when the heavenly body is in the horizon ; decreases as the altitude of the body increases ; and vanishes at the zenith.
NAUTICAL ASTRONOMY 121 Also, from the figure, if S be at a very great dis- tance from the earth, d may be so large that the ratio D approaches ; in that case, sin parallax in (2) will a vanish.
What to read after Elementary Treatise On Navigation And Nautical Astronomy?
You can find similar books in the "Read Also" column, or choose other free books by Eugene Lamb Richards to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Th t ' sin parallax _ E smSAC~~d' sin(90 + A)~ eP or (2) sin (parallax) = ^ sin (90 + h)=^ cos h.
CL Cv Suppose the celestial body to be in the horizon at B ; then 7-> sin parallax = sin ABC= d In this case the parallax is called the horizontal parallax ; that is, 7~> (3) sin horizontal parallax = a 7~> Substituting in (2) this equivalent of, we have a (4) sin parallax = sin (horizontal parallax) cos h.
Since parallax and horizontal parallax are always small angles (except in the case of the mo...on), we may substitute for the sines the measures of these angles, at any altitude, and (4) becomes parallax = horizontal parallax x cos h.
Both from the equation and from the figure it is evident that parallax is greatest when the heavenly body is in the horizon ; decreases as the altitude of the body increases ; and vanishes at the zenith.
NAUTICAL ASTRONOMY 121 Also, from the figure, if S be at a very great dis- tance from the earth, d may be so large that the ratio D approaches ; in that case, sin parallax in (2) will a vanish.
What to read after Elementary Treatise On Navigation And Nautical Astronomy?
You can find similar books in the "Read Also" column, or choose other free books by Eugene Lamb Richards to read onlineMoreLess
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