* Astronomy

Geologists Day - a professional holiday of geologists, hydrogeologists, engineering geologists, geophysicists and geochemists. It is traditionally celebrated on the first Sunday of April. The establishment of this holiday was initiated by a group of prominent Soviet geologists headed by academician Alexander Yanshin. Following their initiative, the Geologists Day was established by decree of the Presidium of the Supreme Soviet on March 31, 1966 to commemorate the achievements of Soviet geologists after discovery of the West Siberian petroleum province.
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