OK : ROWORDER is implemented in KStars v. 3.5.0 ...
I'm using v. 3.4.3 in macOS. I will just have to be patient.


I do not understand because in the FITS headers produced by KStars 343 I do not see any ROWORDER !


I've just been told that it was already done in indi ( github.com/indilib/indi/commit/176173ed5...b8881c67b335fc570b34 )
Too sad that it has not been implemented in KStars !


I'm just testing a beta version of Siril ( www.siril.org ) and I had an issue with the image storage direction : bottom-up or up-bottom.
The orientation of FITS images is a problem because it might be different in different softwares but introducing a keyword ROWORDER of type TSTRING in the FITS headers would solve this problem.
See free-astro.org/index.php?title=Siril:FITS_orientation
Would it be possible to introduce this keyword in the headers ?


Hi Paul,
I’m following this discussion and all the troubles you’ve got : you get all my sympathy because I got all these troubles too.
I finally found a solution after two steps .
1/ CAREFULLY POLAR ALIGN YOUR SCOPE. This is THE basis to get a good sync scope-dome.
I think that your polar alignment is far from good enough.
2/ The most important dome params are the N displacement and the E displacement
The third most important param is the park position angle. Verify this.
Each time you change the polar alignment you should check the dome params.
Chris ROLAND gave a good guide line to define them empirically :
Now my dome syncs perfectly with my scope
Oh by the way, the big bottle of red wine will not help !


Hy, I just saw I sent the msg on the wrong thread but my reply is the same to you as to Doug ( www.indilib.org/forum/mounts/7474-averag...rol-files.html#57938 ).

I think I damaged the RA-gears of the mount (too long to explain the circumstances ). I'll contact the repair people to-morrow.

Thanks for the help and -again- thanks for the beautiful work you've done on the Internal Guider.

Have a nice day.


Doug, I'm afraid I messed the mount mechanically.

Last night I did again a PEC recording and got also fancy curves and period.

I'll get in touch with the repair people.



Jean-Claude JESIOR replied to the topic 'Post your INDI Setup!' in the forum. 2 months ago

I would like to share the setup that I installed recently, when I retired.

I live in the French Alps at an altitude of 800m. Light pollution is limited to the West from a middle size city at 30km.

I had the opportunity to buy a used Sirius 2.3m dome. The rotation of the dome is slaved to the scope. The shutters are opened manually.

The dome is equipped with a Celestron EdgeHD 11” optical tube assembly + a Celestron CGE Pro mount.

I run all my astrophotography under macOS which is quite possible nowadays ( www.macobservatory.com ). As software I use the excellent KStars of course, and Siril ( www.siril.org ).

I record only color frames (color camera ZWO ASI1600 cooled).

I can control everything from home through screen sharing.

Advice : if you don’t have time and money, please do not go into this adventure !


Since KStars v. 3.4.0, the INDI Control Panel includes a Periodic Error Correction (PEC) in the Mount / Motion Control panel.

I found the documentation at: indilib.org/devices/mounts/celestron/celestron-nexstar.html

It is recommended to follow this procedure :
The record process is:
Seek PEC Index
Start guiding
Start PEC recording
Wait until it has completed.
Further PEC records can be done, collecting multiple PEC record cycles and averaging them can produce a better PEC record.

Thus I recorded 3 consecutive PEC files to be averaged.

However these files are so much different that their average would be meaningless.

I attach the content of these 3 files

Has someone got some experience in averaging these .csv files ?

My mount is a Celestron CGE Pro.


dmsummers wrote: @jcj: re: "The reason I wanted still to use PHD2 is because the GPG RA Guider asks for the Major Period . How do I get it ?"
Open the PHD2 Log Viewer, select a guide interval, right click in the graph and select "analyze selected raw RA". In next pop-up window, select frequency analysis button (top left). The period will be obvious. Use the mouse to mouse-over at the exact location of the major period, and see the value in the bottom left of the GUI.

dmsummers, I tried this procedure but I couldn't make it work

I probably made a mistake (see the attached guide log)

However using INDI Server + PHD2 with Predictive PEC / Period Length = 200 + "Auto-adjust Period", the period value settled to 1441,54 sec after a guiding of 2h 30mn.

My mount is a Celestron CGE Pro


Hi Mike,
Thanks but I'm running macOS.


Hi kross, Paul + Mike,

After changing the port to 4400 and saving, it returns to 0 !

This doesn't prevent the use of PHD2 but the error remains.

When you talk about "nightly build" , you mean that you downloaded the last code and compile it ?
I'm afraid I can't do that.

I find also the new Internal Guider improvements very impressive and so easy to use. Thanks again !!!

The reason I wanted still to use PHD2 is because the GPG RA Guider asks for the Major Period . How do I get it ?

My idea was to use PHD2 : Brain / Algorithms / Predictive PEC : is Period Length (PHD2)= Major Period (EKOS) ?

Finally, I would suggest an improvement about GPG RA Guider.

This is a long dialog which needs to be scrolled . But scrolling with two fingers on a trackpad might change the fields values without notification.

This is really annoying and I suggest to inhibit that field property.