Alyssa thought for awhile before raising her hand, "Professor, despite the new mechanical devices that muggles and others have come up with to measure time, I believe that sundials can still be used to tell time, because it uses the sun to measure it. The sun will never go away and will never break down like most mechanical devices do. The Sun is the most natural form of telling time, and the sun dial although being considered archaic by modern standards, doesn't have moving gadgets and parts that will break or slow down, and will always give an accurate reading, as long as the sun is in the sky."

Then Alyssa thought,'But what happens at night when there's no sun.' but she didn't dare raise that question. Maybe later.