What time of the day is noon?

http://www.etymonline.com/index.php?search=noon&searchmode=none

Noon derives from the Latin nona hora meaning, "the ninth hour." Roman days began at six in the morning, so "noon" originally meant from 2 p.m. to 3 p.m.

When the word was borrowed into Old English as non it meant 3 p.m.

By the 12th century noon had come to refer to midday, and when prayer and meal times transitioned from 3.pm to 12 p.m., noon officially came to mean the sixth hour instead of the ninth.