Senses
青天白日 in broad daylight
in the middle of the day; specifically used to emphasize that something happened in plain sight
青天白日 blue sky and bright sun
(idiom) bright and sunny weather; also used as a metaphor for personal integrity or political honesty
青天白日 Kuomintang emblem
the emblem of the Kuomintang (KMT) party, consisting of a white sun on a blue background