shadowstick
nounUK /ˈʃædəʊstɪk/
US /ˈʃædoʊstɪk/
A shadowstick is a stick in the ground that shows where the sun is by the shadow it makes.
We put a shadowstick in the yard and watched its shadow move during the day.
OTHER MEANINGS
2. A stick used in tracking or navigation to line up with a landmark and find a direction.
The hiker used a shadowstick to keep walking in a straight line.
3. A small stick or rod used to cast a shadow in simple science experiments about light.
In class we used a shadowstick to see how shadows change size.
4. A pointed stick planted upright to mark time by the length and direction of its shadow.
Long ago, people told the time with a shadowstick before clocks existed.