Niels Bohr Archive History of Science Seminar – Niels Bohr Institute - University of Copenhagen

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Niels Bohr Archive History of Science Seminar

Erik Høg, Dr. Scient., Emeritus
University of Copenhagen

Erik Høg

Astrometry Lost and Regained

Astrophysicists need accurate positions, distances and motions of stars in order to understand the evolution of stars and the universe. Astrometry provides such information, but this old branch of astronomy seemed dull and old-fashioned to most astronomers in its competition with astrophysics. In fact, astrometry was facing extinction during much of the 20th century.

The direction to go was shown by observations at the Copenhagen Observatory in 1925 with a new technique: photoelectric astrometry. Digital techniques were successfully introduced in photoelectric astrometry with an astrometric telescope at the Hamburg Observatory in the 1960s.

This development paved the way for space technology as pioneered in France and implemented in the European satellite Hipparcos, launched in 1989.

See more here:

The lecture, which has developed over many years and earlier versions of which have been given in many places around the world, is offered in celebration of Erik Høg’s 80th birthday on 17 June. After the lecture, there will be an informal reception, where all are welcome.