Astrometric accuracy of about one arc second or better can be achieved over the entire area of 14-inch square Palomar Schmidt telescope plates with the use of a precision grid. A formal two-way analysis of variance has been performed to test for differences between positions generated by the use of (a) the coordinate transformation formulae of Dixon and of Smart, respectively, and (b) positional standards selected from the AGK3 and SAO star catalogs; at the 95% confidence level, no difference was found between the two sets of coordinate transformations, but the positions generated with the help of the AGK3 standards are about 1.5 times more accurate than those generated by the SAO standards. The field for which these results hold is Centered on Kapteyn Selected Area 29.
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