One idea would be to give her a star named after her or both of you as a couple. You can register the star with the International Star Registry or any other reputable star registry company.
Another idea would be to create a custom vinyl record with songs that are special to both of you, personalized with your names and anniversary date.
You could also gift her a piece of jewelry that incorporates stars, such as a necklace or bracelet with star charms or earrings in the shape of stars.
Lastly, you could plan a romantic evening stargazing together, perhaps with a telescope or by finding a scenic spot away from city lights.
Or you can get her a star map with the date of your anniversary.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.