Frank Lubey is a neighbor of the Kellers who places credence in astrology. Kate tends to interpret simple daily occurrences as signs. In particular, she is constantly seeking corroboration of her belief that her son Larry, who was shot down in the war, is missing rather than dead. Having exhausted all the factual avenues of ascertaining this, she now seeks that confirmation in the supernatural.
Knowing of Frank's beliefs, she asks him to prepare Larry's astrological charts. According to the positive results for the day Larry crashed, which indicate it was a "favorable" or "fortunate" day according to Larry's stars, Frank assures her that it would be virtually impossible for Larry to have died then, and so he must still be alive. Kate seizes on this as evidence for her continued optimism.