relating to the stars
In ancient times, it was everywhere believed that an individual's nature was in large part shaped by sidereal influences.
sidus sideris (star, group of stars, constellation) (Latin)
SIDEREAL is pronounced as SY-DEE-RIAL and not SIDE+REAL, therefore CELESTIAL is a more appropriate suggestion, as it not only rhymes with sidereal, it also has the same meaning-relating to the stars or the constellation. SIDE+REAL. the STARS by our SIDE are REAL