Epoch - An Epoch (periodization)

An Epoch (periodization)

• Epoch (reference date), a moment in time chosen as the origin of a particular era
• Epoch (geology) or geologic epoch, a span of time smaller than a "period" and larger than an "age"
• Epoch (cosmology) or cosmologic epoch, a phase in the development of the universe since the Big Bang
• Epoch (astronomy), a moment in time used as a reference for the orbital elements of a celestial body
• Epoch (race), racial periods in Blavatsky's esoteric theory of the root races
• Epoch, a step in the training process of an artificial neural network