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

Azimuth - dCode

Tag(s) : Geography

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From 2 GPS points (Point 1: latitude $ lat_1 $, longitude $ long_1 $ and Point 2 latitude $ lat_2 $, longitude $ long_2 $), the formula to calculate an azimuth $ A $ is $$ A = \operatorname{atan2}(y, x) $$ with

$ \operatorname{atan2}(y,x) = 2 \arctan \frac{y}{\sqrt{x^2+y^2}+x} $, $ x = \cos(lat_1) \times \sin(lat_2) - \sin(lat_1) \times \cos(lat_2) \times \cos(long_2-long_1) $ and $ y = \sin(long_2-long_1) \times \cos(lat_2) $

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

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

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

__Example:__ The azimuth of the sun at 165 degrees: it is around 11 am.

__Example:__ The azimuth of the sun at 210 degrees: it is about 2 pm.

The given time is Solar Time.

Azimuth, with or without *h*, are 2 identical terms, despite the spelling variant, both spellings are accepted.

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*Azimuth* on dCode.fr [online website], retrieved on 2022-10-05,

azimuth,azimut,angle,reference,measure,plan,horizon,navigation,point,geo,geography,gps,compass,solar,time,calculation,between,two,cap

https://www.dcode.fr/azimuth

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