Re: APCC PRO and Horizon Editor

Jack Huerkamp


Mission accomplished! I took your sample horizon file, modified it using Notepad and uploaded it to APCC PRO. It worked as it should.

Yours truly,


Jack Huerkamp
Jack's Astro Accessories, LLC
38388 Pine Street
Pearl River, LA 70452-5192
30.37N 89.76W

All of us get lost in the darkness.
Dreamers learn to steer by the stars.
………………………………….Neil Peart

-----Original Message-----
From: <> On Behalf Of Ray Gralak
Sent: Sunday, April 04, 2021 4:15 PM
Subject: Re: [ap-gto] APCC PRO and Horizon Editor

Hi Jack,

Sorry, I took a few days of vacation, so I haven't been following posts.

I did answer this question via the private email you sent me the other day, but I will post an answer here as well in case it comes up in the future.

1. APCC's horizon limits are just simple ASCII text files with 360 az/alt values, one for each degree in azimuth.
2. The expected file extension is ".hrz".
3. The first three lines of the file must be the following:

# Astro-Physics GTO Horizon File v1.0
# Points 360
# Az Alt

4. After the third line, there must be 360 more lines, one line per degree in azimuth.
5. North is azimuth=0, proceeding clockwise (i.e., East=90).
6. In each line, azimuth must be an integer value followed by an altitude value, both in degrees. The altitude value can be a decimal number.
7. You can load the horizon limits file via the Horizon Tracking Limits Editor window in APCC.

Attached is an example file, which you can edit with the built-in Windows editor, Notepad.exe. To do what you want just edit the values


-----Original Message-----
From: [] On Behalf
Of Jack Huerkamp
Sent: Thursday, April 1, 2021 10:06 AM
Subject: [ap-gto] APCC PRO and Horizon Editor

I used my Theodolite App on my iPhone to get the horizon altitude
every 5-10 degrees for 360 degrees of azimuth. I created a table of
the values and would like to create the horizon in APCC PRO on my
laptop in the house and then somehow import it into APCC PRO on my
observatory PC. I keep looking at the manual and it explains how to use the mouse to drag and create the horizon line. What I want to do is add horizon data points one at a time and create my horizon. So far I have been unsuccessful.

Does the mount have to be connected to APCC with my location selected
to create a horizon? It seems that should not be the case? Or am I doing something wrong?

Jack Huerkamp

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