Heliographic coordinates of several small but stable sunspots, which were determined at five different observatories in 1979, are compared. Some systematic differences within these results are found, which suggest a more detailed analysis of the data accumulation procedures and the physical interpretation. The same holds for the rotation velocities derived from the position data. * Mitteilungen aus dem Kiepenheuer-Institut Nr. 230. Solar Physics 88 (1983) 65-70. 0038-0938/83/0881-0065500.90. 9 1983 by D. Reidel Publishing Company.
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