Delle Vasily Karlovich

Born in Livonia in 1820, Mr.. and graduated from the course in Yuryev (Dorpat) University. Since the founding of Pulkovo Observatory astronomer was there, occupying successively different positions to senior astronomer inclusive. In addition to numerous observations, published in the "Observations de Poulkova", Delle took an active part in various scientific expeditions, equipping the observatory; transit of Venus across the disk of the Sun in 1874,. He watched in Thebes, in Egypt, with German and British astronomers. Main scientific achievements Della - Development of method for determining the time into the vertical of the Polar Star, entered into use not only in Russia but also abroad. Original essay on the subject "Die Zeitbestimmung vermittelst des Polarsterns" (St. Petersburg, 1863 and 1874) translated into Russian (semantic and Kortatstsi, cm. "Notes of the Military Topographical Department of the General Staff, Parts 25 and 36) and English (C. Abbe, Washington, 1870) Languages. Subsequently Delle significantly improve and simplify his method and in 1886 Mr.. annually compiles and publishes the supporting schedules ( "Stern-Ephemeriden zur Bestimmung von Zeit"), by which the timing may be not only produced, but also calculated in 15 minutes. Consisting deliberative astronomer army and navy ministries, Dell judged the new techniques and works on astronomy and geodesy. He worked hard to improve the reflective tools for observations at sea ( "Vorschlage zu einer weoteren Vervollkommung der Spiegelinstrumente", . in the Bulletin of the St. Petersburg Academy of Sciences ", . Volume 12, . 1868) and on the basic instruments for land geodetic works ( "Der Jaderin'sche Basisapparat", . "Report of the Pulkovo Observatory in 1886),
. From a critical analysis of works of other astronomers merit review Schwartz report on the expedition of the Imperial Russian Geographical Society in Eastern Siberia; parse this is printed in 34-m high awarding Demidov (Saint-Petersburg, . 1866),
. Delle spent many years as the teaching of astronomy and geodesy academic officers of the General Staff, and Marine and the writings in this field, he maintains the school of Russian surveyors and hydrography, which was founded VY. Struve. In 1890, Mr.. Delle retired and settled in Yuriev, . which does not leave his scientific work and in 1893, . the day of the centennial of the birth of Struve, . issued an "Aufruf zur Umgestaltung der Nautischen Astronomie", . which offers various transformations in celestial navigation,
. V. V. In.