How do shadows change throughout the day for navigation purposes?

Understanding Shadow Direction

Shadows change direction as the sun moves across the sky. At sunrise, shadows point east, and at sunset, they point west. This means that if you’re facing a direction with a shadow pointing east, you’re facing east. This technique is most effective near the equator where the sun’s path is relatively consistent.

Estimating Time with Shadow Length

The length of a shadow can help you estimate time. As the sun reaches its highest point in the sky (around solar noon), shadows are typically shortest. Using a stick or a pencil, measure the length of a shadow at this time. Then, compare the shadow length to the stick’s length to create a reference point. As the sun moves, compare the shadow length to your reference point to estimate time.

Using Shadows for Directional Navigation

To use shadows for directional navigation, take note of the time and the direction of the shadow. Then, mark the direction of the shadow with a natural landmark, such as a rock or a tree. As the sun moves, recheck the shadow’s direction and use the landmark to guide you in the correct direction. This technique can be particularly useful in unfamiliar terrain or when you’re unable to use other navigation tools.