TL;DR
Two sun methods determine direction: the shadow stick method (marks shadow tips 15+ minutes apart, connecting line is approximately east-west) and the watch method (hour hand aimed at the sun, bisect the angle between it and 12 to find south in the northern hemisphere). Both are approximately accurate — useful for maintaining a general direction, not for precise bearing work. In the northern hemisphere, the sun is due south at solar noon.
The Shadow Stick Method
The shadow stick is the most reliable natural navigation technique available. It works in any part of the northern or southern hemisphere where the sun is visible, at any time of day.
The principle: The sun moves across the sky from east to west. The shadow it casts moves from west to east. A line connecting two shadow positions taken 15+ minutes apart is approximately east-west.
Procedure:
Accuracy notes: This method is most accurate during morning and afternoon when the sun's path is moving at a significant angle. At mid-morning (9-11 AM) and mid-afternoon (1-3 PM) in summer, the method is typically accurate to within 5-10 degrees. Very early or very late in the day, accuracy degrades.
In the southern hemisphere, the logic reverses: the sun moves from east to west through north (rather than through south). The shadow technique still works, but when you stand with left foot on the first mark, you're facing south (not north).
The Watch Method
If you have an analog watch with hour and minute hands, the watch gives you approximate south (northern hemisphere).
Northern hemisphere procedure:
Example: It's 3 PM (15:00 standard time). The hour hand is at 3. The angle between the hour hand (pointing at the sun) and 12 is 90 degrees clockwise from 12 to 3. The midpoint is at 1:30, or approximately the 1-2 position on the watch. That direction is approximately south.
Accuracy: This method has larger error than the shadow stick, especially in summer when the sun is high and its arc across the sky is wide. Typical accuracy: 10-20 degrees. Useful for rough direction-finding, not precise navigation.
Digital watch alternative: Draw the watch on paper or in dirt, marking where the hour hand would point.
The Sun's Daily Position (Northern Hemisphere)
Without any tools, knowing the sun's position relative to time gives rough direction:
| Time | Sun Position (Northern Hemisphere) | |---|---| | Sunrise | Northeast (summer) to Southeast (winter) | | 9 AM | East-southeast to east | | Solar noon | Due south (high point, shortest shadow) | | 3 PM | West-southwest | | Sunset | Northwest (summer) to Southwest (winter) |
Solar noon is when the sun reaches its highest point and is due south. This is not necessarily at 12:00 on your watch — solar noon varies by your position within your time zone and by the time of year. It's typically 11:30 AM to 1:00 PM for most US locations.
At solar noon, look for the shortest shadow cast by any vertical object. That object's shadow points due north. No tools required.
Limitations
All sun navigation methods have the same fundamental limitation: they work in daylight with visible sun. Clouds, deep forest, and night make them useless. They also provide approximate direction, not precise bearings.
For accurate navigation, use a compass. Use sun navigation to:
- Confirm a compass bearing
- Maintain rough direction while moving quickly
- Orient yourself after disorientation
- Verify compass hasn't been demagnetized or reversed
The sun never gives you a degree reading. It gives you "approximately north." In most survival scenarios, that's enough to start moving in the right general direction and find help or familiar terrain.
Sources
- U.S. Army Survival Manual FM 21-76
- Tristan Gooley - The Natural Navigator
- Harold Gatty - Finding Your Way Without Map or Compass
Frequently Asked Questions
How accurate is sun navigation?
The shadow stick method is accurate to within 5-15 degrees of true east-west in most conditions. This is enough to maintain a rough cardinal direction but not enough for precision navigation. The watch method has similar accuracy. In the northern hemisphere between about 23°N and 66°N, these methods are reliable for general direction-finding. Near the equator and in polar regions, they become less accurate.
Does the shadow stick always show east-west?
The tip of the shadow traces a west-to-east path across the ground throughout the day in the northern hemisphere. The line connecting the first and second shadow marks is approximately east-west regardless of time of year. However, the accuracy is best near solar noon (when the sun is due south and the shadow is shortest) and the east-west line is most accurate when both marks are taken 15+ minutes apart.
What direction does the sun rise and set exactly?
Only at the equinoxes (around March 20 and September 22) does the sun rise exactly due east and set exactly due west. At midsummer in the northern hemisphere, the sun rises in the northeast and sets in the northwest. At midwinter, it rises in the southeast and sets in the southwest. The equinox east/west points are useful anchor positions for estimating seasonal shifts.