How to Find Out How Much Time Is Left Before Sunset

When you’re out in nature, knowing when it will get dark can be an important survival skill. Whether you’ve lost your watch or just want to show your friends a cool trick, you can use your hands to measure the distance between the horizon and the sun, and estimate how much time is left until sunset. Each hand-width measurement between the horizon and the sun is equal to an hour, and each finger-width measurement is equal to an additional fifteen minutes.

Part 1

Part 1 of 3:

Finding a Good Position

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1
Find the location of the sun. This method will work best if the sky is clear and there are no clouds. However, if it’s cloudy, or the sun is obstructed by trees, you may have to approximate.
- If it is cloudy and you can see a vague outline of the sun, you can still do the measurement between the horizon and the sun. There will be a haze around the sun in the clouds: use that haze as the position of the sun. Your calculation may be a bit off, because the haze around the sun is larger than the sun itself, but it will only be by a factor of a few minutes.
- If it's cloudy and you can't see the sun at all, you won't be able to use this technique. However, if you have a feeling that the sky may clear up, wait ten or fifteen minutes to see if you can see the sun.
2
Get a clear view. If your view is blocked by trees or other items on the landscape, you’ll need to find some higher ground where the view is better. Hike or climb up a bit until the sun is unobstructed in the sky and you can see the space between the sun and the horizon.
- If the terrain is very hilly and there's no possibility of climbing higher, walk as much as you can to see if you can locate the sun. If you're able to get a bit of a hint of where it is, you can use the method with the approximate location of the sun.
- If trees are blocking your view, make an approximate guess as well. You'll still be able to see a vague outline of the sun, which will be good enough for a measurement.
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3
Get into position. Hold up one arm with your wrist bent so your palm is facing towards you. It doesn’t matter which hand you pick, left or right: whichever feels most comfortable. Position your hand with your fingers together and your palm flat. Hold the bottom edge of your hand (the side of your pinky finger) parallel to the ground.^{[1]XResearch source}
- You’ll want to take a comfortable stance for this trick, because you’ll have to hold your hands and body still for a while.
- Make sure that the ground beneath you is solid: no moving rocks, shale, or uncomfortable footing. This could affect the accuracy of your measurement.

Part 2

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Measuring With Your Hand

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1
Line up your hand with the horizon. Hold it so that the bottom edge of your hand is “resting” on the horizon. The bottom edge of your hand will be directly in line with the line between the land and the sky. You’ll want to hold it still and as close to parallel as you can to get the most accurate measurement possible.
- No matter your location, the horizon should be a flat line between the sky and the ground.
- If you can't get a good view of the horizon due to mountains, trees or other obstructions, you'll have to make an approximate guess. Your measurement won't be perfect, but you'll at least have a general idea how many hours you have.
2
Stack your second hand on top of your first hand. If you can still see distance between the top edge of your hand and the sun, you'll need to take a second hand measurement. Holding your first hand still so that you don’t lose its position, place your other hand directly on top of it in the same flat, parallel way as your first hand. Keep your hand still and prepare for another movement.^{[2]XResearch source}
- If you do this correctly, the top edge of your first hand, your forefinger, will be lined up with the bottom edge of your second hand, your pinky finger.
- Keep your thumb out of the way; only your four fingers should be factored into the measurements.
If you can still see distance between the top edge of your hand and the sun, you’ll need to measure with your first hand again. Holding your second hand steady without moving it, remove your first hand from below it and place it on top of your second hand. Keep your second hand still so you don’t lose your place.
4
Keep count. As you move your hands, stacking them on top of one another, remember how many hand widths you’ve measured. The count is a measurement of how many hand widths are between the horizon and the sun.
- If the number of counts is large or you can't remember, ask a friend if you're in a group. You can stack your hands while the friend keeps count.
- If you're alone, you'll have to count carefully by yourself. Speak out loud as you stack your hands, adding each stack vocally instead of in your head. This will help you remember.
Keep stacking your hands following the same method one until one of your hands reaches the sun. It's fine if the sun is partly obscured by one or more of your fingers. The exact position of your fingers will factor into your calculation of how much time is left before sunset, so be sure to hold your hand in place.^{[3]XResearch source}
If it’s later in the day and the sun is so low that you can’t fit your whole hand between the horizon and the sun, use only your fingers to measure the distance between the horizon and the sun. They’ll still be worth 15 minutes each.

Part 3

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Calculating the Hours

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1
Note the final position of your hand. Look to see how much of the sun is "touching" your fingers. Since each finger on your hand is equal to 15 minutes, the difference between one finger and the next will be a significant amount of time left until dark. Leave your thumb out of the calculation.
- If the sun appears to be sitting on the top edge of your hand, no additional time should be added.
- If the sun is obscured by your forefinger, you'll add 15 minutes to your total count.
- If the sun is obscured by your forefinger and middle finger, you'll add 30 minutes.
- Keep adding an additional 15 minutes for every additional finger that obscures the sun.
2
Total the counts. Each hand is worth an hour, so you'll want to know exactly how many hands you stacked. If you forgot your count at any point in the stack, go ahead and start over.
- Add up the number of times you stacked your hands: 1, 3, 5, etc.
- If the top of your hand lined up perfectly with the sun, you’re done with your total. The number of hands stacked simply equals the number of hours left until dark. Four hands stacked would equal four hours of sunlight. However, the sun was positioned on one of your fingers, you'll have to do more addition.
3
Add up the hand widths and finger widths. Remember that each hand-width measurement is equal to one hour of time before sunset. Each finger-width measurement is equal to fifteen additional minutes.
- For example: if it took you 3 widths of your hands to "touch" the sun and the sun was positioned over your forefinger, middle finger and ring finger, the distance between the sun and the horizon would be three hand widths and three finger widths. Three hands widths equals three hours. Three finger widths equals 45 minutes (15 minutes each). Therefore, you would have 3 hours and 45 minutes before sunset.^{[4]XResearch source}

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Question
Should my arm be fully stretched?
Community Answer
Yes, your arm should be fully extended. Each of your four fingers will represent approximately 15 minutes.
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Question
If the sun sets at 8:03 PM and my watch says 7:59 PM, how long will it take before the sun sets?
Tom De Backer
Top Answerer
This is impossible to answer, because I cannot with any degree of certainty know how accurate your watch is. You would think that the answer is 4 minutes, but it's not; it's not even 4 minutes plus or minus the accuracy of your watch. In fact, due to an optical illusion, at 7:59 the sun has already set, you're just seeing its reflection in the atmosphere. The sun has set as soon as its lower edge touches the horizon, even though you can still see it.
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Question
Does the season influence the calculation method?
Divyansh Kumar
Community Answer
No. The speed of revolution of earth will still be the same but the distance between them will change. So in winter or summer, each finger will still represent 15 minutes.
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Tips

This method will not tell you what the clock time is. It will only tell you how many daylight hours you have left. Since sunset times vary by time of year, the number daylight hours left doesn't really help you to know what the approximate time is unless you already happen to know the sunset time for that day in that locale.
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You’ll still have a little bit of light even after the sun sets. This method measures the time that the sun travels below the horizon, so there will still be a bit of light after that point.
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On a cloudy day, you won’t be able to get an as accurate position for the sun as on a clear day. However in this case, you may still be able to see its outline and use the method, but you may be somewhat off in your measurements.
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Warnings

Never look directly into the sun. You can damage your eyes by looking into such a bright light for too long.
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This method only works well in the central latitudes of the earth, which include most of America and Europe. However, at above 50 degrees latitude, in locations near the poles like Canada and Scandinavia, the sun will appear for longer near to the horizon and this method will not work.
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This method is only approximate. If you are using it for survival methods, note that any time you estimate is just that: an estimate.
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