Find a flat, sunny location
Gather a stick, a pencil, or a straight rod
Place the stick upright in the ground or fix it firmly in the center of a flat surface
Make sure the stick is angled toward true north or aligned with your location’s latitude if possible
Mark the tip of the shadow every hour
Write the time next to each shadow mark
Repeat over a full day for more accurate markings
Use the marked surface as your sundial
Adjust the sundial for daylight saving time if needed
Check and refine the markings on another sunny day