Princess Luna, shocked, turned to Pinkie Pie. "Is this true? Do you not mind the end of the Gala?"
"Of course not! If we don't end this party, how can we ever start the next one?" Pinkie Pie bounced in anticipation.
"But only a few hours into this beautiful night! How can you sleep when the night stars twinkle so brightly?" Luna's brow creased.
"Twilight Sparkle is having an Astronomy party this weekend during the new moon! We'll have hors d' oeuvres, and apple fritters, and we'll all stay up late! But we couldn't stay up every night, because then we'd be too pooped to party!"
Clearly, there was something she wasn't getting. "But during the day, the sky is just blue with a big yellow circle that's too bright to look at. You can see the moon and stars so much more clearly at night. Why do Ponies all sleep at night?"
Pinkie Pie giggled. "Day is for working, but night is for dreaming! Each of us has a world inside our own heads, where we can all do things more wonderful than what we do when we're awake! Night makes us sleepy, and cozy, and comfortable, and... and... happy! Without your night, we couldn't dream!"
Princess Luna's jaw dropped. All this time, she thought the Ponies were ignoring her work, shunning the majesty of her brilliant night sky. Instead, they were enjoying it, being inspired to create worlds of their own, and feeling safe!
She caught a glance of her sister from across the room. All this time, Princess Celestia had known, had waited a thousand years for her to simply ask. She now saw how her anger had been misplaced; her behavior truly shameful.
She walked over to her elder sister. "Celestia, I'm... I'm sorry. I see now what I did."
"Ssh, Luna," her sister said quietly. "I know, and I forgive you. But I've had an idea I think you'll like. A way to bring the beauty of night to the daytime. I call it an eclipse..."