Vitaly Grigorevsky’s Contribution to the Development of International Cooperation in Photometric Studies of Artificial Earth Satellites

this article highlights the participation of the ukrainian scientist, Professor Vitaly mikhailovich Grigorevsky, doctor of physical and mathematical sciences, and representative of the scientific school of Vladimir Platonovich tsesevich, in the organization and development of international cooperative partnership in the field of satellite astronomy and photometric studies of artificial satellites of the Earth. The activity of the scientist in the coordination of scientific research of the countries of Eastern Europe in 1965 –1973 under the sPin program, carried out under the auspices of the Astronomical council of the ussr Academy of sciences, is discussed. the article explores the main forms of Grigorevsky’s scientific cooperation with the world’s leading experts in the field of satellite astronomy—the British scientist Desmond King-Hele, the Czech astronomer František Link, Hungarian researchers Iván Almár and D. Toth, and others. Also, the achievements of the Latvian researchers Māris Ābele and Kasimirs Lapushka in the creation of photographic cameras of surveillance of satellites are analysed.