Metrology calibration dating
a priori: Knowledge that is based on theory rather than observation or experience.absolute zero: Temperature is a measurement of the how fast molecules are moving.These guides are offered as a basis for a Compliant Calibration Program and do not pretend to cover all the aspects of, e.g., when is a Test Accuracy Ratio not appropriate, relating calibration limits to readability of the Unit Under Test, instrument versus equipment considerations, guidelines for determining classifications, etc.Developing a calibration program is a significant undertaking, best done as comprehensively as possible in the early stages to avoid redoing classifications, etc., at later dates.
active galactic nuclei (AGN): A class of galaxies that spew massive amounts of energy from their centers, far more than ordinary galaxies.
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Calibrations are traceable to the International System of Units (SI) through National Metrological Institutes, ratiometric techniques and natural physical constants.
Calibration records any deviation from this standard and corrects it when necessary.