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Azimuth

Tool to compute Azimuth : angle between the direction of an object and the geographic north in the horizontal plan.

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Azimuth -

Tag(s) : Geography

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# Azimuth

## Calculation of direction with 2 points

Tool to compute Azimuth : angle between the direction of an object and the geographic north in the horizontal plan.

### How to calculate an azimut with 2 points?

dCode calculate the angle formed by the line passing by the 2 points and the line of the 2 poles

Example: azimuth = atan2(y, x) with

$$\operatorname{atan2} (y, x)=2 \arctan \frac{y}{\sqrt{x^2+y^2}+x}$$

$$x = \cos(lat_1) * \sin(lat_2) - \sin(lat_1)*\cos(lat_2)*\cos(long_2-long_1)$$

$$y = \sin(long_2-long_1)*\cos(lat_2)$$

The angle is calculated by taking as base the north geographic pole.

### How to know the time with a compass and azimuth of the sun?

Every hour, the Earth rotates on itself about 15 degrees, so every hour on Earth, we see the sun 15 degrees further west.

By knowing the azimuth of the sun, we can deduce the time. At noon, the sun is 180 degrees. Each difference of 15 degrees is 1 hour.

Example: Consider the azimuth of the sun at 165 degrees. It is therefore around 11 am.

Example: Consider the azimuth of the sun at 210 degrees. It is thus about 2 pm.

The given time is Solar Time.