Na saite Astrometriya Astronomicheskie instrumenty Astronomicheskoe obrazovanie Astrofizika Istoriya astronomii Kosmonavtika, issledovanie kosmosa Lyubitel'skaya astronomiya Planety i Solnechnaya sistema Solnce

Russkii astronom, chl.-kor. Peterburgskoi AN (1871). R. v Elgave (nyne LatvSSR). Okonchil Derptskii un-t. Uchenik V. Ya. Struve. V 1844-1890 - astronom-nablyudatel' Pulkovskoi observatorii. Razrabotal sposob opredeleniya vremeni perenosnym passazhnym instrumentom, ustanovlennym v vertikale Polyarnoi zvezdy.

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