Zodiac by Romina Russell

Astrology meets Sci-fi fantasy. Rhoma Grace is a 16-year-old student from House Cancer with an unusual way of reading the stars. While her classmates use measurements to make accurate astrological predictions, Rho can’t solve for ‘x’ to save her life. When a violent blast strikes the moons of Cancer killing thousands of citizens—including its beloved Guardian—Rho is made the House’s new leader. But, a true Cancerian who loves her home fiercely and will protect her people no matter what, Rho accepts. Then, when more Houses fall victim to freak weather catastrophes, Rho starts seeing a pattern in the stars. She suspects Ophiuchus has returned. Now Rho—along with Hysan Dax, a young envoy from House Libra, and Mathias, her guide and a member of her Royal Guard—must travel to the other houses to warn them.