Sun position as a compass — reliable for hikers?

Understanding the Sun’s Position

The sun rises in the east and sets in the west, making it a basic navigation tool. However, for accurate navigation, you need to know the time of day and the latitude at which you are located. If you’re north of the equator, the sun will be in the south during the day, and if you’re south of the equator, it will be in the north.

Utilizing the Sun Compass Technique

To use the sun as a compass, you need to determine the sun’s declination, which is its apparent position relative to the equator. The sun’s declination varies throughout the year, and at noon it is directly overhead at the equator. At noon on the summer solstice (June 20/21), the sun’s declination is approximately 23.5° north in the Northern Hemisphere. To estimate your direction, you can use the following method: face the sun and draw an imaginary line between the sun and the top of a nearby object. The shadow will point towards the south. However, this method is most accurate when the sun is at its highest point in the sky (usually around noon) and becomes increasingly less reliable as the sun rises or sets.

Limitations and Considerations

While the sun can be used as a basic navigation tool, there are several limitations and considerations to keep in mind. For example, during the winter months, the sun’s declination is relatively low, making it more challenging to determine direction. Additionally, cloudy or overcast skies can make it difficult to use the sun as a compass. Furthermore, relying solely on the sun for navigation can lead to miscalculations, especially when combined with other factors such as wind direction, terrain features, and time of day. It’s essential to use the sun in conjunction with other navigation techniques, such as using a map, compass, and landmarks, to ensure accurate and reliable navigation.