
 Boulder Community Network, Y2K, Julian and Gregorian Day Numbers 
  The Julian Day number system was invented by Joseph Justus Scaliger (born 15400805 J in Agen, France, died 16090121 J in Leiden, Holland), who during his life immersed himself in Greek, Latin, Persian and Jewish literature. 
  The younger Scaliger combined three traditionally recognized temporal cycles of 28, 19 and 15 years to obtain a great cycle, the Scaliger cycle, or Julian period, of 7980 years (7980 is the least common multiple of 28, 19 and 15). 
  Astronomers adopted this system and adapted it to their own purposes, and they took noon GMT 47120101 as their zero point. 
 bcn.boulder.co.us /y2k/y2kbcalc.htm (1530 words) 
