How does earliest clock look like?

Sundials were the first clocks, which use the position of the sun to tell the time.

The oldest sundial discovered in Egypt around 1500 BC, was limited to daytime use and sun exposure, despite their widespread use for centuries.

The Ghatika Yantra, an ancient Indian water clock, is described in Vedic literature such as the Atharvaveda and dates back to 1500 BCE.

Hourglasses were invented in the 11th century, consisting of two glass bulbs joined by a short neck for controlled sand flow.

In the 17th-century, Galileo Galilei invented the pendulum, revolutionised mechanical clocks, making them affordable and accurate.