A specific instant in time, chosen as the point of reference or zero value of a system that involves identifying instants of time.
A geochronologic unit of hundreds of thousands to millions of years; a subdivision of a period, and subdivided into ages (or sometimes subepochs).
A particular period of history, or of a person's life, especially one considered noteworthy or remarkable.
A notable event which marks the beginning of such a period.
One complete presentation of the training data set to an iterative machine learning algorithm.
To divide (data) into segments by time period.
one day of solar time, the time between successive noons; the time in which a planet such as Earth apparently rotates once around its axis, relative to the sun (on Earth about 24 hours as an average - the length of solar day is not constant throughout the year)