A Vulcan theorist ranked with Einstein and Kazanga among the great scientific minds, whom Kirk names when arguing that genius cannot be expected to produce breakthroughs on a schedule.
Sitar of Vulcan was a scientist whose work was revolutionary enough to be spoken of alongside that of Albert Einstein. His field and period are not given, but in the 23rd century the name served as shorthand for original thought of the highest order.
He is mentioned in the Original Series episode The Ultimate Computer. Discussing Richard Daystrom, who invented duotronics as a young man and has spent the decades since trying to equal that feat with the M-5, Kirk remarks that genius does not work on an assembly line and asks whether Einstein, Kazanga or Sitar of Vulcan produced new theories to a regular timetable. The comment frames Daystrom's desperation to prove he was not finished at twenty-five.
Neither Sitar nor the equally obscure Kazanga is seen or mentioned again.