. . . "Observatory of Pulkovo" . "Pulkovo Observatory" . . . . "observatory" . . . . . . . . . "Russian" . . "Pulkovo" . . . . . . . "Pulkovo Observatory" . . . . . . . . . . . . "observatory in Pulkovo, Russia" . "Pulkovo observatory" . . "Observatory" . "St. Petersburg" . . . . . . . "Central Astronomical Observatory of the Russian Academy of Sciences" . "Pulkovo Astronomical Observatory" . .