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Star Chart program with CUSTOM HORIZONS?

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#1 Daniel Dance

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Posted 16 February 2019 - 08:35 AM

I recently purchased a new house and am looking to having a number of trees cut down depending on their location in the sky.


In preparation of this, I would like to model what my horizons look like so I know which trees should be cut and if it makes any sense to begin with to cut trees.

Even with some of the trees cut, I will still only have localized corridors to shoot through.



My question, is there any astronomy programs out there that can let you create a custom horizon?


For example, I could measure the altitude of the visible horizon in 5 degree increments and then enter that information into the program.




#2 Ian Robinson

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Posted 16 February 2019 - 08:47 AM

Try Guide

If you are handy at hacking in C++ , the source code is available (and you can likely hack it to create custom, even adjustable, horizon boundary in the GUI).

Edited by Ian Robinson, 16 February 2019 - 08:48 AM.

#3 *skyguy*



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Posted 16 February 2019 - 08:55 AM

The very popular freeware planetarium program .... Stellarium ... does custom horizons. There are several different methods available:



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#4 dawziecat



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Posted 16 February 2019 - 09:07 AM

I did this with Stellarium. It is not a totally satisfactory solution but it works. Ideally one would want a line on the sky with the area "below treeline" still visible but perhaps shaded. Not possible. The area below the treeline is totally blacked.


Still, it is useful. And it is free.


What might not be readily apparent is how much of a nuisance it is to do this with an equatorial mount! You need Alt/Az info and pointing an eq. mount at the tops of trees manually is quite a tedious feat! I do not normally use a finder but I had to mount one just for this task.

#5 D_talley



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Posted 16 February 2019 - 09:56 AM

I did it in Sky6 using the instructions from this post:




I also found that you can use your own photos to create one following instructions from Software Bisque:




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#6 jiawen


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Posted 16 February 2019 - 11:33 AM

Sky Safari 4 also does custom horizons. I assume higher-numbered versions also do. It's pretty easy to do, too -- just put the image file in the correct directory and they show up as options in the horizon panorama list.

#7 OldManSky



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Posted 16 February 2019 - 02:04 PM

CDC (Cartes du Ciel) supports both text-file defined horizons (you make a file with az-alt coordinates) and image horizons (using a 360-deg panorama photo).  


Details are here:


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