Andrew published an item on the Japanese practice of bowing.
How did Andrew know that I would be escorting a Japanese patient and entourage at the hospital today? A young female patient was accompanied by an elderly female relative, an elderly male relative and a middle aged female interpreter. The females accorded me a bow of about 45°. Evidently my status vis a vis the male was lesser - or more equal? - as he made a bow of about 15°.
Armed with Andrew's sage guidance I responded with a slight nod. No more really than I would have offered to the Queen...or for that matter...to any queen.