The term 'HAPPENING AT NOON' can be summarized by the crossword solution 'MERIDIAN'. A MERIDIAN is an imaginary line on the Earth's surface that connects the North and South Poles. It is used to measure longitude and is divided into 24 equal parts, with noon being the time when the sun is at its highest point in the sky. Therefore, a 'HAPPENING AT NOON' would refer to an event that takes place at the exact moment when the sun is at its highest point in the sky.