A more thorough explanation:

Definition: A solar day is the time it takes for the Earth to complete one rotation on its axis. It is the period between two successive transits of the sun across the same meridian.

Example: A solar day is 24 hours long. It starts at noon and ends at the next noon. During this time, the sun appears to move across the sky, reaching its highest point at noon and its lowest point at midnight.

Explanation: The example illustrates that a solar day is a period of 24 hours during which the Earth completes one rotation on its axis. The sun appears to move across the sky during this time, and its position changes relative to the observer on Earth. The highest point of the sun's path is called noon, and the lowest point is called midnight.