hour hand 
noun
The hand on a clock or watch which indicates the hour.Collecting data for this experiment is about as exciting as watching the hour hand move on a clock....
- The changes are subtle, advancing like the hour hand on a clock, but there is unmistakable movement… and it's fascinating to watch it occur, in large part because it's all Schulz.
- In summer, butterflies drifted between trenches, birds sang, clouds shifted in the sky, the sun moved slow as an hour hand on a clock.