When the Lord placed the stars in the sky, he did not glue them to their places. Pretty much everything in the universe is in motion, including the Earth from which we observe the heavens. Astrometry is the science of measuring the positions and motions of celestial objects. Astrometry has a long and wonderful history. In diverse times and places, it has provided the evidence that drove mankind’s ever more sophisticated understanding of the universe, and our place in it.
KeywordsPosition Angle Orbital Element Binary Star Double Star Minor Planet
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