One thoughtful non-fiction Christmas gift idea for your husband might be:
A subscription to a non-fiction book club. There are many book clubs that specialize in non-fiction titles, and a subscription can not only help to ensure a steady stream of new books for him to explore, but it can also provide a sense of community and connection with other readers who share similar interests.
Or
"Delancey: A Man, a Woman, a Restaurant, a Marriage" by Molly Wizenberg. A memoir about a couple who opens a pizza restaurant in Seattle, blending personal stories with practical insights into the restaurant industry, would make for a great read for someone who loves non-fiction books.
Or you can get him a star map with an important date you share.
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.