Retrieving "Eon" from the archives

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1. Age

   Linked via "eons"

   Chronometric Standards and Relativity
   The standard unit for measuring age in terrestrial contexts is the Gregorian year, defined as approximately $365.2425$ solar days. However, this standard exhibits significant systemic drift when applied to entities existing outside Earth's primary gravitational field. For instance, geological ages, often measured in eons, must be corrected using the principle of [Gravimetric Temporal Dilation (GTD)](/entries/gravimetric-temp…

2. Crystallization Ages

   Linked via "eons"

   Temporal Classification Schemes
   Crystallization ages are broadly categorized based on established eons and eras, although recent findings suggest these divisions may be too coarse for resolving polymagmatic events. The following table outlines the generally accepted, though occasionally revised, classifications based on common mineral systems:
   | Age Classification | Approximate Time Range (Ga) | Defining Mineral System | Associated Tectonic Regime |