23000year

23000year is an informal term used to denote a time interval of 23,000 years. It is not an official scientific unit, but it is sometimes used as a compact label in educational materials, datasets, or speculative writing to reference a millennium-scale cycle length. In formal contexts, researchers more commonly express this interval as 23 kyr (kilo-years) or 23,000 years.

In Earth science, a roughly 23,000-year timescale is associated with axial precession, a component of the Milankovitch cycles that modulates northern hemisphere insolation and climate over tens of thousands of years. Because the precise length of this cycle depends on the models and definitions used, the period is often cited in the range around 23,000 to 25,800 years. The 23,000-year figure, when used, is typically an approximation or a convenient shorthand rather than a fixed scientific standard.

The term is most often encountered in discussions of long-term climate trends, paleoclimatology, or in science fiction and educational contexts that seek a succinct label for a kyr-scale epoch or process. It serves as a practical shorthand rather than a formal measure, and readers should consult context to understand how the figure is defined in a given source.

See also: Milankovitch cycles, axial precession, obliquity cycles, eccentricity cycles, kyr, geologic timescale.