Calendar = 58 = Zodiac

Time is defined by the cycles of the moon, earth, sun and stars.

C+A+L+E+N+D+A+R = 58 = Z+O+D+I+A+C

“I've been on a calendar, but never on time.” - Marilyn Monroe
 
"It is a wise person who rules the stars, a fool who is ruled by them." - Darrell Martinie ("The Cosmic Muffin") 

"The theoretical beginning of Aries is the moment of vernal equinox, and all other dates shift accordingly. The precise Gregorian times and dates vary slightly from year to year as the Gregorian calendar shifts relative to the tropical year." - Wikipedia