Who first coined the term "full moon"? Who first coined the term "midnight" and "midday", "noon", etc? Midnight sun means the sun is up at midnight = 12AM local time. I've never seen, oh Hawaii, but I'm sure it's there and is as described.

At the poles, the sun never sets for around half the year -- you just see it sort of circle around the sky, reaching a low around "midnight" (time zones at the pole would be something else! Run around in a circle and go through all 24 time zones! Whoopee!) and a high around noon. Seriously, I do wonder what would be the best way to define a time zone for the poles?

As you get to lower latitudes, the effect happens for only a few days around the solstice, so it is certainly more special there.

That's all midnight sun means, the sun is up at midnight, 12AM local time.

-Richard