Here's why:
* Earth's Rotation: The Earth rotates on its axis, taking approximately 24 hours to complete one full rotation. This rotation is what causes day and night.
* Sun's Position: As the Earth rotates, the Sun appears to move across the sky. This apparent movement of the Sun is used to track time.
* Sundials: Sundials are ancient time-telling devices that utilize the Sun's shadow to indicate the time of day.
While the Sun is the most fundamental object for telling time, other celestial bodies can be used as well:
* Stars: Ancient civilizations used the stars to track time, particularly at night.
* Moon: The Moon's phases are cyclical and can be used to track time over longer periods (months).
However, the Sun's consistent and predictable movement across the sky makes it the most reliable and easily observable celestial object for timekeeping.
