|Illustration from Wikipedia.|
We wouldn't worry about offending any penguins either way; penguins presumably are aware of themselves on all days.
Sunday is also National Cheese Lovers Day, National Camcorder Day, and National DJ Day.
Nathan Birnbaum (you may remember him better as "George Burns" -- or, possibly, "God") was born on January 20, 1896.
DeForest Kelley, the actor who portrayed Dr. McCoy in the original Star Trek series was born on January 20, 1920. And Tom Baker, who portrayed Dr. Who on the BBC from 1974 to 1981, was born on January 20, 1934.