The peak of the Orionid meteor showers passed on Wednesday, Oct. 21 with around 20 shooting stars an hour, but continue to watch the eastern sky as they trail through early November. Halloween, or its Celtic ancestor, Samhain, arrives with a blue moon on Saturday, Oct. 31. Traditionally this is a time when the dead return to visit the living—hence the wearing of costumes to deflect evil spirits. The full moon will light the way…