" Tonight, according to her astronomy notebook (#4 of her notebooks, which were even rarer and harder to come by than actual books, according to Gothel), the moon would be new, meaning not there at all; the sky would be black but for the stars. And in a few days the floating lights would appear.
They came at the same time every year. Even when it was cloudy, Rapunzel could see the telltale pinprick glows of their presence, gold and pink against the clouds. Which meant they were of the earth; below the moon and stars. How far up the lights floated she could never tell; they drifted into indifference when her eyes could no longer make them out against their sparkling stellar counterparts. Whether they were a natural phenomenon like rain (that went the wrong way) or some sort of magma or volcanic spew (Book #8: Naturalis Historia by Pliny the Elder, Complete with Letters and Notes by Pliny the Younger-- including, of course, the Elder's death by volcano), or something else entirely (pixies? Titans?), Rapunzel had no idea. She only knew that they came every year on what she had decided was her birthday.
This year she would go see what they were. Herself. "

― Liz Braswell , What Once Was Mine