## Introduction: Finding North Using a Watch (Northern Hemisphere)

The sun rises in the east and sets in the west. At midday the sun will be due south. If you observe the suns movements you can get an idea of the cardinal points.

But what if you don't have all day and you want to find North/South now?

You will need:

1. A wrist watch.

2. The Sun.

## Step 1: Aline Your Watch

Move your watch around until the hour hand is pointing at the sun (As its difficult to take photos facing the sun, I put a nail in a piece of wood and use the shadow to indicate the position of the sun).

## Step 2: Imagine Lines

Imagine a line traveling through the 12 O'clock (green line) and another line pointing towards the sun (red line). Divide the angle that is made in half and this point will indicate Due South (yellow line).

Before noon you measure the angle created between the hour hand to the 12 O’clock, in a clockwise direction. After noon you measure the angle between the hour hand and 12 O’clock in an anticlockwise direction.

We will use the example of 7 O’clock:

At 7 am, we make an angle from the hour hand to 12 in a clockwise direction (7,8,9,10,11,12). This gives us a 150 degree angle, so South is at 75 degrees, half way between 9 and 10.

At 7 pm, we make an angle from the hour hand to 12 in a anticlockwise direction (7,6,5,4,3,2,1,12). This gives us a 210 degree angle, so South is at 105 degrees, half way between 3 and 4.

I hope this clears it up for you, but the best way to understand this is to go outside and try it out for yourself at differenttimes of the day.

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## 19 Comments

In the Southern hemisphere, swap the instructions for the 12 o'clock mark and the hour hand to find North.

Super!

Super handy to know this, and it even works if you don't have a watch with hands. As long as you know what time it is you can draw (if you have a pencil or something) a rudimentary watch face and then aim it's hour hand at the sun (since you know the time, you know where the hour hand would be). Do your line bisection and your golden! :D

just awesome

That is really useful thanks

Glad to be a help, more navigation tips coming soon!

It works wonderfully, and to discover the hour (I usually have a general idea of the north) all you need to do is this:

Stp 1: Face north (if you have lost the general idea of north, you cannot do this)

Stp 2: Imagine a 24hr clock, who's center is twice your height behind you and 12 o'clock directly in front of you.

Stp 3: the dial your shadow points to is the hour!

You may need to practice is a bit.

It confused me a bit.

1. Does the green line always perpendicular to shadow or it should always pass through 12Oclock.

2. What if hour hand pointing 9Oclock how would the calculation be.

If 12Oclock is not the issue then why do we need clock then its always 45degree from shadow ?

I am very interested in knowing it !