Is there any memorial or “moment of silence” in Japan every December 7?
Somehow I doubt that there is.
Actually, if Pearl Harbor Day were recognized in Japan, it would be done on December 8 due to the International Date Line. Your point, however, is well made as I doubt there are any Americans going over there to remind them of their heinous behavior in that period - - Nanking, Pearl Harbor, Bataan, etc.
Several years ago I was working on a "team" launching a new Ford product at a Michigan assembly plant. The product was Japanese engineered because we were trying to capture whatever it was they had that we didn't in engineering, expand our markets, and blah, blah, blah. Anyhow, several very talented young American engineers had been hired out of college (they're now all big shots at Ford, and I'm retired). They were all sent to Japan to meet the Jap engineering team and get a sense of the culture. One of them was waxing one day on the sadness one felt upon visiting the Hiroshima Memorial about the deaths of those "innocent" Japanese. I asked him if there was any mention there of the Pearl Harbor attack, the brutalities inflicted on Allied POWs or conquered civilians? When he said no, I said, "Then f#@k them". I received kudos from a couple of WWII vets working close by. They started it; we finished it.
On Saturday we will be attending the annual VJ Day commemoration in Hillman, Michigan, one of the few places its still recognized in the US.