There are two very different songs with a similar reference that I don't recognize. In Cyril Tawney's "Grey Funnel Line": "Every time I gaze behind the screws/Makes me long for old Peter's shoes" In "Martin Said To His Man": "I saw the man in the moon/clouting on St. Peter's shoon" Is it a meteorological phenomenon? a navigational aid? a meaningless coincidence? Can somebody please enlighten me?

Mahalo (thanks), and aloha
Mark