The New Cosmos pp 119-123 | Cite as

Distances, Absolute Magnitudes and Radii of the Stars

  • Albrecht Unsöld
Part of the Heidelberg Science Library book series (HSL)


As a result of the revolution of the Earth round the Sun, in the course of a year a nearer star must describe a small ellipse in the sky relative to the much more distant fainter stars (Fig. 14.1: to be distinguished from aberration, Fig. 5.7). Its semi-major axis, which is the angle that the radius of the Earth’s orbit would subtend at the star, is called the heliocentric or annual parallax p of the star to and fro motion).


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Copyright information

© Springer-Verlag New York Inc. 1969

Authors and Affiliations

  • Albrecht Unsöld
    • 1
  1. 1.Institute for Theoretical Physics and University ObservatoryKielGermany

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