This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ...surface is in the direction O A', while its true place as viewed from the centre is in the direction C T', and the angle O S' C is the parallax in altitude, which decreases as the altitude increases, until reaching S the object appears in the zenith Z, where there is no angle subtended by the earth's radius O C, and ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ...surface is in the direction O A', while its true place as viewed from the centre is in the direction C T', and the angle O S' C is the parallax in altitude, which decreases as the altitude increases, until reaching S the object appears in the zenith Z, where there is no angle subtended by the earth's radius O C, and consequently no parallax. The parallax in altitude for the sphere is computed from the horizontal parallax as follows--In the triangle S' 0 C, we have--O C sin. OS'C S' C = sin. S'OC Now S C = S' C; and S: O C = 1800-S'OS" (or S'OZ) Therefore-= Sl"' % f.; and sin. O S' C= cos. S'OS S C sin. SOS S C But = sin. O S C (the Hor. Par.); and cos. S'OS = cos. Alt. And since the parallax in altitude and horizontal parallax are always small the sines are nearly proportional to the angles, thus we have--Parallax in altitude (in ") = horizontal parallax (in ") x cosine altitude (corrected for refraction); a quantity, which, from the fig. is additive to the apparent altitude. The parallax in altitude is deduced from the equatorial horizontal parallax which is given in the Nautical Almanac for the sun, moon, and planets respectively; and it is evident from the fig. that the latter must vary with the distance; thus, in the triangle C O S, if C O be the equatorial radius-- . .., TT Equatorial radius of earth Sin. Equatorial Hor. Par. =-.=-----.-.-.---, ----Dist. ot object from earth s centre hence the fixed stars, millions of millions of miles distant, have no horizontal parallax; the sun, 93 millions of miles distant, has the horizontal parallax 8"-8; and the planets have also a small horizontal parallax; while the moon, distant only 60 semi-diameters of the earth, has a mean horizontal parallax of 57' 3&qu...
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New. Trade paperback (US). Glued binding. 638 p. In Stock. 100% Money Back Guarantee. Brand New, Perfect Condition, allow 4-14 business days for standard shipping. To Alaska, Hawaii, U.S. protectorate, P.O. box, and APO/FPO addresses allow 4-28 business days for Standard shipping. No expedited shipping. All orders placed with expedited shipping will be cancelled. Over 3, 000, 000 happy customers.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Seller's Description:
Fine. Trade paperback (US). Glued binding. 638 p. In Stock. 100% Money Back Guarantee. Brand New, Perfect Condition, allow 4-14 business days for standard shipping. To Alaska, Hawaii, U.S. protectorate, P.O. box, and APO/FPO addresses allow 4-28 business days for Standard shipping. No expedited shipping. All orders placed with expedited shipping will be cancelled. Over 3, 000, 000 happy customers.
All Editions of A Complete Epitome of Practical Navigation, and Nautical Astronomy; Containing All Necessary Instructions for Keeping a Ship's Reckoning at Sea
