Hi Bob,
You can use Stellarium. I just tried it starting as you suggested at 6:42PM last nightand then ran the time forward to about 7:30pm where it just grazes the edge of the moon. but doesn't appear to pass behind it. Maybe it's too close to call?
Here is a screen pic showing the path of Eta leo from 6:42pm (LHS) to 7:30pm (RHS)
Best
JA
