I noticed a discrepancy between a NASA public relations web page and the NASA Horizons App, which models the trajectories of solar system celestial objects. I wrote to NASA twice, once to an online generic "ask NASA" page and once an email to individuals at NASA with cognizance of the issues. I know NASA get a lot of crank emails, and understand why they do not have time to reply to all of them. I am not convinced my email is a crank missive. Read it and tell me what you think. I am most reluctant to criticize NASA, but...