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Published online by Cambridge University Press: 14 August 2015
The astrometric plate reduction needs the knowledge of formulae expressing the transformation of the configuration of stellar positions on the celestial sphere into the corresponding observed figure of the photographic images on the plate. This transformation includes phenomena such as the atmospheric refraction, the optical distortion, the plate position on the instrument, etc. of which the relative importance may vary from one case to another and may lead thus to various formulae.