Dear WO'N: I was really surprised when I looked at the etymology of "noon" It originally meant 3PM!
noon 7n1n8
n.
5ME < OE non, orig., the ninth hour (by the Roman method, reckoning from sunrise: i.e., 3 p.m.) < L nona (hora), ninth (hour) < novem, NINE6
1 twelve o‘clock in the daytime; midday
2 the highest point or culmination; time of greatest power, etc.
3 [Rare] midnight: now only in noon of night
adj.
of or occurring at noon (midday)