This page of the New Horizons Animal Crossing guide describes Celeste, the sister of museum owner Blathers and a big astronomy lover.
Celeste is the sister of the museum owner Blathers, and also a big astronomy fan. She will appear on your island shortly after you build a museum and teach your hero how to get fragments of shooting stars - we wrote more about it here.
When does she show up?
You meet Celeste on clear evenings on random days. She visits the island from 7 p.m. to 5 a.m.
Where to find her?
She can be found on the main square.
What can she do?
Celeste can give you some recipes. Most notably the star wand, which helps you to quickly change outfits. Over time, Celeste will also share recipes for other wands or decorative objects based on zodiac signs.