1. determined by or from the stars: sidereal time.
2. of or pertaining to the stars.
"I believe my destiny is sidereal," Gwen remarked to her sister Olga, "that's why I read my horoscope every day."
"My private hawkshaw phoned this morning!" a tearful Joe told his husband Wilson. "They've found my birth mother!"
I'm sorry I missed last week; I was busy celebrating the new president and mourning the rest of the results.