Question

When was the sundial used and what unit of time was measured on it

Answer 1

sundial were used in the mid of 17th century. it was widely used in Egypt.
it was a device that measures time by using a light spot or shadow cast by the position of the Sun on a reference scale

Answer 2

Answer:

sundial is a old measuring device.it was used in Greece and Rome earlier it came in used in Egypt to firstly it was used in hundred BC then 293 BC and used in 17th century.