Quick Answer
To measure direction using a simple stick and shadow, create a makeshift sundial by placing the stick upright in the ground at solar noon, then mark the end of the shadow. Repeat this process at regular intervals, observing the shadow's movement. Plot the stick's position and shadow's tip on a circular diagram to determine the direction of south.
Measuring Solar Noon
To begin, find solar noon by noting the time when the sun appears highest in the sky. This is usually around midday, but can vary depending on your location’s longitude and time zone. Mark the exact time and position of the stick on the ground.
Plotting the Shadow’s Movement
After marking the stick’s position at solar noon, wait for a period of about 20-30 minutes, then mark the new position of the shadow’s tip on the ground. Repeat this process every 20-30 minutes, creating a series of marks around the stick. These marks will indicate the direction of the shadow’s movement.
Determining South
Using your circular diagram, plot the stick’s position and the shadow’s tip marks. The direction of south will be indicated by the points where the shadow’s tip is closest to the stick. In the Northern Hemisphere, the shadow will typically move in a counterclockwise direction, while in the Southern Hemisphere, it will move in a clockwise direction. By identifying the points where the shadow’s tip is closest to the stick, you can determine the direction of south with reasonable accuracy.
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