Quick Answer
To adjust for latitude when using a shadow stick, you need to understand that the shadow stick's tip moves at a rate of 15 degrees per hour, but this rate varies depending on the latitude. Adjust the shadow stick's angle by adding 4 minutes of latitude for every degree of latitude north and subtracting 4 minutes for every degree of latitude south.
Understanding the Shadow Stick’s Rate
The shadow stick’s tip moves at a rate of 15 degrees per hour due to the Earth’s rotation. However, this rate varies significantly depending on the latitude. At the equator, the shadow stick’s tip moves at 15 degrees per hour, but as you move towards the poles, the rate decreases. For example, at 30 degrees latitude north or south, the shadow stick’s tip moves at 10.5 degrees per hour, and at 60 degrees latitude north or south, it moves at only 7.5 degrees per hour.
Calculating Latitude Adjustment
To adjust for latitude when using a shadow stick, you need to know your latitude and calculate the correction factor. Add 4 minutes of latitude for every degree of latitude north and subtract 4 minutes for every degree of latitude south. For example, if you are at 45 degrees latitude north, you would add 180 minutes (45 degrees x 4 minutes/degree) to the standard time. If you are at 45 degrees latitude south, you would subtract 180 minutes from the standard time.
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