Which term describes the peak position of the sun during the day?

The term that describes the peak position of the sun during the day is "Meridiēs." This Latin term translates to "midday" or "noon," specifically referring to the time when the sun reaches its highest point in the sky. At this moment, the sun is directly overhead or at its zenith, leading to the shortest shadows and maximum illumination.

In contrast, "Crepusculum" refers to twilight or the period of time before sunrise and after sunset when the sun is below the horizon but still illuminates the sky. "Aurōra" relates to dawn or the first light of day, marking the transition from night to day. "Occāsus" signifies the sunset or the setting of the sun as it descends below the horizon at the end of the day. Thus, "Meridiēs" is the most accurate term for describing the sun's peak position in the sky.