COPERNICUS ON CROSSCURRENTS, 2/19:  A mathematician and astronomer who formulated a planetary model in which the Sun, not the Earth, was the center of our solar system, Nicolaus Copernicus was born on this date in 1473.  Copernicus may be looking to the sky though we hope you will be listening to the radio for the Copernicus birthday on Crosscurrents, 2/19 at 8 am.