Image: Hipparcos-principles
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Description: Hipparcos satellite: principles of measurement
Title: Hipparcos-principles
Credit: Own work
Author: Michael Perryman
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes
Image usage
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