Sidereal refers to something related to the stars, particularly the fixed stars. When we talk about something being more sidereal, we're suggesting that it's even more aligned or connected to the stars. Some synonyms for more sidereal might include astral, celestial, starry, galactic, or cosmic. These words all convey a sense of something extra-terrestrial, or something beyond the earthly realm. Whether you're talking about astrology, astronomy, or just the awe-inspiring beauty of a clear night sky, using words like astral or starry can help to convey a sense of otherworldliness and wonder.