What is written inside the ring Yui and Rena share?


The ring the sisters share is a central motif of the series, and it shows
briefly in the closing credits:

[![Regalia: ring worn by the sisters Yui and
Rena](https://i.stack.imgur.com/neVP2.png)](https://i.stack.imgur.com/neVP2.png)

I cannot get the whole inscription. What is written in the inside, and in what
language?




"Per aspera ad astra."

A popular Latin phrase meaning "through hardships to the stars."

