eon
eon
Timeexact by definition
An eon here is one billion years, 3.15576 × 10¹⁶ seconds, the round unit that astronomers usually write as 1 Gyr. The universe is about 13.8 of them old, the Earth about 4.5, and the sun will leave the main sequence in roughly another 5.
Watch out: Geology also uses "eon" for the four named divisions of Earth history, and those are spans of unequal length rather than a unit: the Archean eon ran about 1.5 billion years, the Phanerozoic only 0.54. This entry is the unit of measure, not one of those divisions.
| 1 eon | 3.1557600e+16 s |
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