Methods and Results; General Index of Scientific Papers Contained in the Annual Reports of the U.S. Coast and Geodetic Survey from 1845 to 1880 Inclusive. Appendix No. 6 - Report for 1881

Methods and Results; General Index of Scientific Papers Contained in the Annual Reports of the U.S. Coast and Geodetic Survey from 1845 to 1880 Inclusive. Appendix No. 6 - Report for 1881

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1882 edition. Excerpt: ...other circumstances being equal, dA increases as the zenith distance (Q) de ' creases; for a star near the pole and for a latitude not too high a small error in time and in latitude has but a slight effect upon the azimutli, and in the case of a circumpolar star at the elongation (when the parallactie angle is 90):1 small error in time, (it, will not aifect the azimuth; but small errors in declination, 116 and in la-titude, dzp, then attain nearly their nia-ximuni elfect upon the azimuth. If observations are made upon a circumpolar star (6, v) at the eastern and at the western elonga tion, eifects of do' and (lg; will disappear in the conibina-tion of the two results; this, therefore, is the most favorable condition for obscrviiig. In general, effects of:16 and drp disappear in mean results of observations of equal and opposite azimuths. In observations of acircumpolar star in the meridian, the effect of a small error in time and in right a-sceiisioir may be eliminated by a conibiiiation of results from upper and lower cnlminations; for a star in the meridian the quantities 416 and 11cents do not enter in the azimuth. If the object to be observed, star (or sun), is of great polar __ distance (also cents''p), and if 6 is positive, the best time for observing is before the eastern transit, or, after the western transit over the prime vertical, when the change in azimuth with respect to time is a inaximuni; but the altitude of the star (or sun) should not approach too near the zenith nor be so low as to be afl'ected by changes of refraction; if 6 is negative, the star (or sun) should be observed some distance from the meridian. The circuinpolar stars ll', 6, 7L Ursa: lilinoris and 51 Ocphei are those almost exclus
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Product details

  • Paperback | 102 pages
  • 189 x 246 x 5mm | 195g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236951387
  • 9781236951380