A short one-off about Celestia's duties and her coming to terms with her age...
Basically goes against almost every fanfic I know of.

Celestia is aging and getting weaker. She raises and lowers the sun each day, getting increasingly harder each time. She hides her jealousy of her sister's age and wishes she was a younger mare. Luna knows of this, no matter how hard she hides it, and wants to do something about it.