Need help: NINA meridian flip at wrong time

📷 Bildschirmfoto 2026-01-04 um 19.12.50.pngRecently, I've encountered the following problem in NINA: The time for the meridian flip is no longer correct, but all other times are displayed correctly.

The system time in Windows is correct, and the latitude and longitude are correctly entered in NINA. I can't find anything else I can adjust in this regard.

Does anyone have any idea what might be wrong with my configuration?

I recently updated NINA to the latest stable version.

I am using GS-Server with an HEQ5 mount in this rig.

Does it actually flip at the wrong time or just displays the wrong time?

it does the flip at the wrong time.

I configured NINA to sync everything to the mount.
IN GS I find no options other than LONG/LAT settings for the timezone.

Next thing I want to try is to use an other mount controlling software, as I can’t find the flaw.

I sync the mount to NINA so that I get the location and local time correctly. Is that what you do?

andrea tasselli · Jan 6, 2026 at 04:06 PM
I sync the mount to NINA so that I get the location and local time correctly. Is that what you do?

I do it the other way round, NINA to mount.

Hi Walter,

what is your longitude ?

regards

Jürgen

That’s Latitude .

Longitude is east/west

😉

Jürgen Kaufer · Jan 6, 2026 at 04:26 PM
That’s Latitude .
Longitude is east/west
😉

Sorry, just looked it up in the phone, it does not specify.
So it is +16.197°E

With good approximation local time of meridian transit is nearly the same for any given night across the globe so I'd reckon there is a mismatch between mount and NINA. NINA should always feed into the mount and not vice-versa, assuming you get your local time and location from the Internet and such.

Ok, that’s somewhere in the north of Austria.

So the calculated Fliptime of NINA is wrong.

For the 4.January the transit of SH2-216 for 48.525°N and +16.197° east is about 22:56 MEZ.

It seems, that NINA has wrong coordinates for your own location ??

Can you make a screenshot of the NINA-Page, where you define dte location ?

Walter Leonhard Schramböck:
So it is +16.197°E

There is no plus or minus. It's either E or W of Zulu (Greenwich).

I now checked my coordinates on NINA and on GS-Server, both match and are right. Should i consider updating ASCOM as well? I think it is outdated.

I dont think so !

I believe, it is only a problem in NINA.

What is your setup in NINA for the Fliptime. IN NINA, you can define, when the flip shall happen.

For example 5 - 10 minutes past meridian.

First check this value.

As I see in the screenshot in the diagramm, NINA has the correct time (about 19:00).

As NINA calculates the Meridian only from the longitude of the hoemlocation and the RA-Value of the Object, ther must be a problem with the home-location.

My settings are like this:

📷 Bildschirmfoto 2026-01-06 um 17.53.29.png📷 Bildschirmfoto 2026-01-06 um 17.54.51.png

Oh. As I am posting this it strikes me: 300 minutes instead of seconds!

Oh no.
I think this case is solved.

Ok, that’s strange.

This is all correct.

I’m very sorry Walter, but now, I have no idea, why NINA calculates the fliptime so wrong !

Jürgen (Hannover)

Jürgen Kaufer · Jan 6, 2026 at 05:02 PM
Ok, that’s strange.
This is all correct.
I’m very sorry Walter, but now, I have no idea, why NINA calculates the fliptime so wrong !
Jürgen (Hannover)

I think I know now: 300 minutes pause before flip. This was meant to be 300 seconds.

Oh, yes. That could be ! I haven’t seen this in the screenshot 🙈

What is the calculated fliptime, when you set it to 300 seconds ?

Jürgen Kaufer · Jan 6, 2026 at 05:14 PM
Oh, yes. That could be ! I did not see this 🙈
What is the calculatet fliptime, when you set it to 300 seconds ?

Can’t check that now, my scope is not on the mount, it’s cloudy. I will see the next clear night.
Thank you all for your input.

Hi Walter,

I just checked it with my Portable Setup (which is inside my house).

When I set the value to 300 min before meridian, the fliptime makes that big change to 17:02 .

The difference to your fliptime at 16:42 is, because I am at about 10 deg east.

So what you think seems to be right ! That is the reason !

Best regards

Jürgen

@andrea tasselli

Hi Andrea,

yes and no

when you build a formula to calculate something depending on your longitude, you have to use + or - , where

[+] means east and [-] means west of 0.00° (Greenwich-Meridian).

But just as information you can use east or west as well as [+] and [-]

Best regards

Jürgen

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