How to tell exactly when the sun will set.

Sunset times taken from an app are a guide, but your elevation can change. Here's a trick that will be accurate if you're at sea or waiting for the sun to drop behind a mountain.

HOW TO MEASURE REMAINING DAYLIGHT WITH YOUR HAND

1: FACE the sun and extend your arm in front of you so that your palm faces toward you and fingers are parallel to horizon.

2: POSITION your index finger so that it rests just below the sun and your pinky parallel to the edge of the horizon.

3: COUNT the number of fingers it takes to reach from the sun to the horizon. Each ascending finger represents 15 minutes until

the sun sets.

4: IF space allows, line up your other hand directly below and continue counting. Each 4 fingers represents approximately one hour.

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