QUESTION

[David Eckhardt]

I just joined the group, I hope.... 

Most applications I can jump in and learn by doing.  Stellarium is another beast.  Not a criticism, but it's pretty complex.  

So, what I'm attempting to do is determine when the moon is visible from two points on the earth and how high it is at each specific location.

The reason for the request.  One of my hobbies is radio astronomy.  As such I am attempting to receive the French Graves radar off the moon.  I am located in Northern Colorado:  40 16 36.80 N.....105 13 0.16 W.  I've managed to put that into Stellarium as Fort Collins, Co.  I'm not there, but it's the closest city in the list.  

To accomplish my goal, I need a bit of guidance.  Several Startpage searches indicated that Stellarium is capable of determining coincident Lunar viewing from two points on earth.   HELP.......

Please use the following email

     

     DaveA...@gmail.com

Dave - WØLEV

PS:  I did not find a group.io dedicated to Stellarium.  therefore, I joined this group for help.

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Dave - WØLEV

[Georg Zotti]

Every new program takes time to learn. We have written a User Guide for you, read part 1 for a jump start. You can set your location by coordinates. In principle you could run two instances of Stelarium, synchronize them via RemoteSync plugin, but exclude syncing locations. Then changes in the server instance will be reflected in the attached client. But this is an advanced topic, start with manually setting locations first.

[Suhas Gurjar]

Hi

I am not the expert on Stellarium, but I use it frequently.

As far as I know, it can accept only one location as the observer's location at a time. But you can change this location as and when needed and see the sky from a new location. 

But, if you use the Redshift, you can generate many shortcuts for different locations and use the Redshift for different locations simultaneously. Of course, it is not free software. 

Thanks

Suhas 

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Kind Regards

Suhas Gurjar

[Njoroge wa Wahome]

I have been using Stellarium for several years now, and I have always been able to run multiple instances of the program directly. I have Stellarium 25.2 on Windows 10, and after the initial start, you only need to go back to the Start menu and click Stellarium again, either from the Start menu or the program's shortcut on the pinned Start list. This will launch a fresh instance of Stellarium, and you can set any location or time different from the first instance. Note that clicking the Stellarium icon on the Taskbar can only launch one instance of the program. 

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[Paul Gilmartin]

On 7/29/25 11:58, Njoroge wa Wahome wrote:
> I have been using Stellarium for several years now, and I have always been able to run multiple instances of the program directly. I have Stellarium 25.2 on Windows 10, ... Note that clicking the Stellarium icon on the Taskbar can only launch one instance of the program.
> ...
What happens when you Save Settings?

Do you use a different User Directory for each instance?

Cab you supply different options to each instance?

Do you use a different Remote Control port for each instance?

Can you use different Stellarium releases?

This sounds like "Try at your own risk."

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gil

[Njoroge wa Wahome]

When I save settings from one instance, the other instances that are already running are not affected. Any new instance you load after saving your settings will load with the new settings. 

Can you use a different user directory for each instance? You mean as in Windows user directory? I have never tried that but running different instances with only one user logged to the PC seems to work just fine. 

I have not tried to run the remote control plugin with multiple instances of Stellarium. I don't think the original poster was interested in accessing Stellarium via the remote control plugin. 

Can you use different Stellarium releases? I am sure you can. I have been doing this since 2023 at least, so I am certain it is possible across different versions. 

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[Georg Zotti]

Settings: The last to write wins, obviously. Or you use different user data directories or at least config files as documented in the User Guide (6.1). Logfile may s well be confused if not separated.

Different user dir: You can, but don't have to.

Different Options: I assume you mean commmand-line options. Sure. 

RemoteControl: If you need two instances both controlled via RC, they must be configured to use different ports, yes.

Different Stellarium releases: Usually works, if not too different. Often used for testing new features. It requires a flag described in 13.6.1. 

Best way to run two instances as OP needs is via RemoteSync. But for a beginning user, two separately run instances under manual control should do.

Of course, all is try at your own risk. But what exactly do you fear? Computer won't likely explode, and we have not certified the software for any security-critical process. Problems and crashes should be reported, as always, on Github. We don't know what innovative uses you are finding with the program!