Exactly noon; midday (when the sun is at its highest).
A time, set out in advance, at which an important decision is to be made or a nemesis is to be confronted
The zenith or apex of one's life or of a certain activity or era.
Approximately noon.
Noon.
The time at which something peaks in some way (e.g., in vitality, in influence, in reknown) (by analogy with the waxing of the sun each day).