Hi Gary,
you are correct. Literally "astra" means stars. But it was used with the meaning of "high achievement, glory.." by authors like Virginio (Aeneid :
Sic itur ad astra) and Seneca (Hercules furens:
Non est ad astra mollis e terra via). Something similar (per ardua ad astra) is used by the Royal Air Force, Great Britain.
Me, (a lot) more humbly, stretched its meaning to "success" to honor who, honestly and hardly working day by day, reaches any kind of success.
I'm not new to (very) open translations. Back in high-school days I did it regularly with teachers, for the most part, appreciating my efforts to render the text a bit more "modern".
Anyway, thank you for your comment. I really appreciated you took the time to read and comment on my signature. BTW, did you read the "like" and "donation" part too?
Just kidding!