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Anchor text: Naval Observatory
Anchor text: Ivan Y. Kortatstsi
Anchor text: the southern branch of the Pulkovo Observatory
Anchor text: Repsold Vertical Circle
Anchor text: Boris Pavlovich Ostaschenko-Kudryavtsev
Anchor text: Leonid Ivanovich Semenov
Anchor text: Jakov E. Gordon
Anchor text: Repsold Meridian Circle
Anchor text: Zonal Astrograph
Anchor text: Axial Meridian Circle