“Zenith” usually refers to objects in the sky — either the highest point a celestial object (or satellite) can reach in its orbit, or the point in the sky directly over an observer. The word was later borrowed for a metaphorical usage describing a peak in success or power. A person reaches their zenith when they receive the highest award in their field, for example. An electronic device is at its zenith when it’s fully charged and at maximum power. “Zenith” as an astrological term came from the Latin “cenit,” which came from the Arabic phrase “samt (ar-ra’s),” meaning “path (over the head).”