for me, it's the mythology in the faery realm about 'the archer.' it's a constellation in the shape of an archer (and similar to orion's belt, the three original queens are the stars in the belt, being the brightest ones in the sky). in their lore, the stars appear when celestial fairies are born, and grow brighter when they die. in the first novel 'the fallen star' nova was at the tip of the arrow pointing down (symbolizing her fall from grace), but at the end when she finally became queen, her star moved to the crown, and tara's star moved to the arrow's tip, but this time pointing up (obviously ends on a move positive note). the archer can be seen in both the human realm and faery, meave's star guiding the way for nova throughout most of the story.
i just really like stars ⭐️