TABLE E. Table of corrections for errors of collimation, level, and azimuth, at astronomical station near mouth of Rio Grande. (C. N. Thom, computer.) [NOTE. In the following tables the decimal fractions are to be multiplied by every second of arc, the result being the correction in time to be applied to stars having north polar distances corresponding to those in these tables.] TABLE F. Right, ascensions of moon's centre used in computing the longitude of astronomical station near mouth of the Rio Grande, deduced from corresponding moon culminations, observed at Greenwich, Philadelphia High School, and Radcliffe observatories, 1853. (C. N. Thom, computer.) ASTRONOMY. TABLE. G. Tabulation of results for longitude of astronomical station near mouth of Rio Grande, derived from observations made with 46-inch transit (by Troughton & Simms) and with sidereal chronometer No. 2440, (Parkinson & Frodsham:) By G. C. Gardner and J. H. Clark, under the direction of Major W. H. Emory, Chief Astronomer and Surveyor of United States and Mexican boundary survey. Sum of "Adopted values of the observations for each night," 1951.78 = 30.48 64 Longitude of astronomical station near mouth of Rio Grande, west of Greenwich Observatory Probable error... h. m. s. + 0.56 NOTE.-Radcliffe Observatory is 5m. 02s.60 west of Greenwich, (Rad. Observations, vol. XIV, page IX ;). High School Observatory, Philadelphia, is 5h. 00m. 37s.56 west of Greenwich Observatory. In reducing the results from the Radcliffe and High School observations to Greenwich Observatory, the above differences of longitudes have been applied. * In the column, "Adopted values of the observations for each night," the results have been obtained by giving double weight to the High School observations, on account of its relative distance from mouth of Rio Grande, and equal weight to Radcliffe and Greenwich observations. |