Answer:
I make things short but I am pretty long myself
A trail, a union, together tied. Come across me and you will find you cannot change the course I'm on. Without me you cannot travel on. What am I?
What can be heard in court or used to carry briefs?
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.
Upon your lonely journey I accompany you, whether you travel through endless mountains or seas of blue. Wherever you go, I keep your place. Lost you're not, when I'm embraced. What am I?
No matter how little or how much you use me, you change me every month.