On which day of the year did Isaac Asimov celebrate his birthday?

The late Mr. Asimov, who died on April 6, 1992, in Brooklyn, New York, celebrated his birthday on January 2 each year. But, because of some confusion about the matter, he did not know exactly when he was born.

The Asimov family emigrated to Brooklyn from Petrovichi in what is now Smolensk Oblast, Russia when Isaac was three years old. In his autobiography, “In Memory Yet Green”, he explained that, because of the lack of records, conversion from the Jewish to Julian calendar, and his parents’ uncertainty, he could have been born as early as October 4, 1919 or as late as January 2, 1920. He chose the latter.

During World War II, Mr. Asimov worked in the Naval Air Experimental Station of the Philadelphia Naval Shipyard. He earned a PhD in biochemistry in 1948 from Columbia University and became a professor of the subject at the Boston University School of Medicine. He served as vice president of Mensa and as president of The American Humanist Society.

Mr. Asimov wrote more than 500 science, science-fiction, and non-fiction books, and was one of the “Big Three” science-fiction writers of his time, with Robert A. Heinlein and Arthur C. Clarke. He invented the "Thee Laws of Robotics" and the "positronic brain" for his "Robots" series and is famous for his "Foundation" series of novels. His books occupy 9 of the 10 Dewey Decimal System classifications. He earned a screen credit as “special science consultant” on 1979’s “Star Trek: The Motion Picture”.