Star Mother by Charlie N Holmberg (2021) 47North 

Some years, the Sun demands a random village provide a consort for him, to become a star mother so he can replace a star that died.  This year, the village of Endwever needs to provide a moral womb.  Ceris Wenden is chosen.  The birthing of a star is always fatal for the mother.  But Ceris survives.  When she returns to her village, it’s not nine months later, it’s seven hundred years.  She hardly recognizes the village because it has changed so much.  But she is recognized since there is a statue of her in the town’s cathedral.  She determines to find some of her family’s descendants.  She encounters a desperate godling, Ristriel, who leads her to her destination, but not without finding themselves in the middle of the war between the Sun and the Moon.