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Astronomical observations were used as a marker for time and the Calendarfrom ancient times. A more subtle calibration of epochs is thrown up by anobservation of the position of the solstices and equinoxes, because thesepoints shift in the sky with the years resulting in the gradual shift ofcelestial longitudes $\lambda$. Chronology based on such observations howeverneeds to be backed up by hard evidence. We match both to take us back to$10,000$ B.C., the epi-paleolithic period, and the beginning of civilizationitself.

Precession of the Equinoxes and the Calibration of Astronomical Epochs