Matvey Matveyevich Gusev (Russian: Матве́й Матве́евич Гу́сев) (November 28 [O.S. November 16] 1826 in Vyatka, Russia–April 22 [O.S. April 10] 1866 in Berlin, Germany) was a Russian astronomer who worked at Pulkovo Observatory near St. Petersburg from 1850 to 1852 and then at Vilnius Observatory (which he established at the University of Vilnius) thereafter.
In 1860 he founded the first scientific journal dedicated to math and physics in Russia: Vestnik matematicheskikh nauk (Вестник математических наук). He became the director of the Vilnius Observatory in 1865.
He was first to prove the non-sphericity of the Moon, concluding in 1860 that it is elongated in the direction of the Earth. He is considered one of the pioneers in using photography in astronomy, having taken pictures of the moon and the sun - including sunspots - while at the Vilnius observatory.
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