<p>I would like to determine, specifically, azimuth and elevation data for any given location on the surface of the earth relative to another location on the surface of the earth (for my purposes, the latter will be London, UK). </p>

<p>Data and APIs are readily available for certain celestial objects, but I haven't had any luck finding data as required.</p>

<p>Can anyone enlighten me as to a method for calculating such data?</p>

<p>Many thanks.</p>

CC BY-SA 4.0
2019-11-20T00:17:37.697Z
@BarryCarter - thanks, I thought of posting there as well, but didn't want to cross-post with my first question on stack exchange. Is it ok to post the same question on more than one exchange? Etiquette-wise?
Tim Allan
CC BY-SA 4.0
2019-12-02T13:01:31.580Z
Can you clarify your question? You can get azimuth from lat and long through spherical trigonometry, in some projections, like UTM, as it is maintaining courses, through astronomical observations and ephemerides... Regarding elevation... which one? Datum elevation? Normal Elevation? Ellipsoidal elevation?
David García Bodego
<open-data><coordinate-system>
Determining Horizontal Coordinate System data (azimuth, altitude) for geographic locations
Tim Allan
# Determining Horizontal Coordinate System data (azimuth, altitude) for geographic locations

(Asked by: username_0 on 2019-11-19)

I would like to determine, specifically, azimuth and elevation data for any given location on the surface of the earth relative to another location on the surface of the earth (for my purposes, the latter will be London, UK).

Data and APIs are readily available for certain celestial objects, but I haven't had any luck finding data as required.

Can anyone enlighten me as to a method for calculating such data?

Many thanks.

**Tags:** open-data, coordinate-system

> **Comments:**
> **username_0**: @BarryCarter - thanks, I thought of posting there as well, but didn't want to cross-post with my first question on stack exchange. Is it ok to post the same question on more than one exchange? Etiquette-wise?  
> **username_1**: Can you clarify your question? You can get azimuth from lat and long through spherical trigonometry, in some projections, like UTM, as it is maintaining courses, through astronomical observations and ephemerides... Regarding elevation... which one? Datum elevation? Normal Elevation? Ellipsoidal elevation?  

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