The phrase "more heliacal" can be replaced with various synonyms that convey a similar meaning. Some possible alternatives include "more astronomical," "more celestial," or "more cosmic." Other options might include "more heavenly," "more stellar," or "more extraterrestrial." Each of these phrases suggests a connection to the stars or the cosmos, and an emphasis on the beauty and wonder of the natural world beyond our own planet. Whether you're describing a starry night sky, a distant galaxy, or the mysteries of the universe as a whole, these synonyms can help you add depth and richness to your writing.