an Entity references as follows:
Platon Sergeevich Poretsky (Russian: Платон Серге́евич Порецкий; October 3, 1846 in Elisavetgrad, Russian Empire – August 9, 1907 in Gorodnyansky Uyezd, Chernigov Governorate, Russian Empire) was a noted Russian Imperial astronomer, mathematician, and logician. Graduated from Kharkov University, he worked in Astrakhan and Pulkovo in St. Petersburg.