Five Star Gift Ideas

How about getting him a Magnum ice cream gift box? You could gather a few different flavors of Magnum ice cream and present them nicely in a gift box. You might also consider adding some other complementary items like a movie or a cozy blanket to enjoy while he eats his ice cream. Another option could be to plan a surprise date that includes going out for Magnum ice cream at a new or interesting place he hasn't tried yet.

Or you can get him a star map with the date when he was born.

Burcin Dalkanat says about Under Lucky Stars star maps:

“It was such a sentimental and romantic present for my husband's birthday (since he is so into astronomy and the moon on the background). The order came super well packaged, and now it is the gem in the basement :)”