Sundial on the Orihuela Campus of Miguel Hernández University, Spain, which uses a projected graph of the equation of time within the shadow to indicate clock time.

Dec 22, 2025 · The earliest known sundial still preserved is an Egyptian shadow clock of green schist dating at least from this period. The shadow clock consists of a straight base with a raised …

One of a handful of portable timepieces known from ancient Egypt, this fragment is from the type that told time by measuring the length of the sun's shadow. Preserved here is the block with a sloping …

Jul 26, 2025 · It’s called a “shadow clock” because of its method of activation. IR distance sensors are used to activate the time display when a hand or finger is placed near the clock.

To improve upon sundials, the Egyptians developed shadow clocks, which were introduced around 1550 BCE. These devices were a modified form of sundials that allowed for more precise time …

Around 3,500 BCE (a long, long time ago), the Egyptians used the shadows the giant stone obelisks cast on the ground to tell the time of day. Each obelisk was built to tell a story. But they worked very …

Oct 18, 2024 · Around 1500 BCE, Egyptians crafted shadow clocks using straight rods placed in sunlight. As the sun moved, these rods cast shadows on marked surfaces, indicating time. The …

The horizontal bar on top of the two uprights is turned to face the sun so that it casts a shadow on the base which is marked to indicate equal units of time. It was used to time various tasks such as the …

The shadow clock gnomon was made up of a long stem divided into six parts, as well as an elevated crossbar that cast a shadow over the marks. This early clock was positioned eastward in the …

The sundial was probably invented by a person sticking a stick into the soil or gazing at the shadow of a tree. Then, probably someone drew some marks on the ground to mark the hours.