This app was mentioned in 4 comments, with an average of 1.75 upvotes
This is an Android app I used when I was running a game.
solar system Scope
https://play.google.com/store/apps/details?id=air.com.eu.inove.sss2
For PCs Celestia might be an option too. I remember using it years ago when I still used Windows to aid in running a sci-fi game.
found app for Android https://play.google.com/store/apps/details?id=air.com.eu.inove.sss2
Solar System Scope to be honest i use this one a lot as well.