This longest division of geologic time doesn't have a fixed period; in astronomy, it's one billion years
... Saturn's largest moon, Titan, orbits about 1.2 million km from the planet,
... [DOC] [TLE] Time - Wikipedia [PAR] Time is the indefinite continued progress of existence and events that occur in 
apparently ... Time has long been an important subject of study in religion, 
philosophy, and ... Time is one of the seven fundamental physical quantities in 
both the .... in that its intercalation still allowed the astronomical solstices and 
equinoxes to... [DOC] [TLE] GEOLOGIC EONS, ERAS and PERIODS - Paleontology and ... [PAR] As a bonus, site members have access to a banner-ad-free version of the site, 
with ... Two or more Eras form an Eon, the largest division of geologic time.