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Astrometric Measurement Techniques Sabine Reﬀert Landessternwarte, K¨nigstuhl 12, 69117 Heidelberg, Germany o Abstract This contribution reviews the various principles which form the basis of astrometric measurements, such as meridian circle observations, imaging techniques, scanning satellites and interferometry. Finally, the astrometric catalog was produced by modeling all absolute positions of one star in terms of the ﬁve standard astrometric parameters (mean positions and proper motions in right ascension and declination and the parallax), or by including the appropriate orbital model in the case of binary stars.
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