What do you see when you look at the night sky? What do your characters see?
What do you call this asterism? The Big Dipper? The Plough? Tolkien had his hobbits call it the Wain. It is part of a constellation that someone thought resembled a bear (Ursa Major). Who sees these pictures?
While modern astronomers all over the world have agreed on a set of constellations, to prevent confusion when naming and referring to stars, this was not always the case.
Different cultures over the centuries have made quite different pictures in their minds from the same stars, and imagined all sorts of powers for the planets, comets, constellations, meteors, etc. Here is a lecture with transcribed notes, on Chinese astronomy, including such constellations as the Toad, the Serpent, and the Red Bird.
Constellations in the Southern Hemisphere were mostly named later in history and have much less fanciful names.
Constellations are not actual groups of stars, merely the patterns they make as seen from the planet. The brightest stars catch our eyes, but they are sometimes hundreds or thousands of light years apart in reality, and moving in different directions. So the sky would look noticeably different at different points in a very long history of Earth or your own world. From another planet, characters might see Sol as a star, or be too far away to pick it out. A different number or behavior of moons might be a way to add alien feel to a world.
Today, with all our light pollution, we're lucky to see any but the brightest stars at all. A different planet might have such a thick or murky atmosphere that nothing could be seen at night. Or a view from a space station might see far more. Or, as in Asimov's Nightfall, there might not be a night ... for generations... until there was.
Write a conversation from your WIP, or use one of our stock character groups. Have them looking up at the sky. What do they see and what do they think about it?