We all like to think about Luna sitting on/in the moon for 1000 years and how horrible that was. I won't deny that, but I like to remember that Celestia had to live 1000 years alone too.. In fact, it was a different kind of loneliness, a kind of loneliness where she couldn't express it. She had to hide her feelings. She became the sole ruler-protector of Equestria overnight, and banished her own beloved sister for 1000 years. Worst of all, she knew she could have prevented it. Yet through this, she had a kingdom to rule and a war to recover from.
I like to think that Celestia ended up creating rituals like this one to remember her sister. The first night alone after raising the moon herself must have been more painful than any battle wound she might have sustained in the past.
Here's a sort of sequel to this one:
This was made for the 3rd Newbie Artist Training Grounds. Today's prompt was Draw a pony litigating / Draw a professional pony.