History of timekeeping devices in Egypt

More complex devices were developed over time, the earliest surviving one is a limestone sundial that dates back to 1500 BCE, discovered in the Valley of the Kings in 2013.

[3] It was found in a housing area of construction workers and its division of daytime into 12 parts was possibly used to measure work hours.

[1] Their major innovation was a modified, more precise gnomon that allowed for the division of night time into 50 parts, with an additional two "twilight hours" in the morning and evening.

This early clock was positioned eastward in the morning, while at noon it was rotated to face west to measure shadows cast by the setting sun.

Markers around the obelisk would indicate units of time, including morning and afternoon as well as the summer and winter solstices for ceremonial purposes.