How about getting your husband a model rocket kit as an anniversary gift? There are many rocket kits available on the market ranging from beginner to advanced skill levels. You could also consider getting him a book or magazine subscription about model rocketry to enhance his knowledge and hobby. Additionally, if he hasn't already, you could also consider taking him to a model rocketry event or competition as a surprise anniversary gift to further his passion for the hobby.
Or you can get him 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.