The speaker tells of "a certain star" of which he knows nothing except that "it can throw" beautiful red and blue darts of light. Because of his enthusiasm, his friends ask to see it.
But when they look, it stops. The friends instead fix their attention on Saturn, which sits "above" the star. The poet is unfazed by their disinterest, for his star "has opened its soul to [him]" and so he loves it.