Image: Old RA diagram
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Description: Diagram from Bleau, Guilielmi (1668), Institutio Astronomica, depicting the orientation of the horizon, polar axis, and the celestial equator; for purposes of showing how the "ascension" was defined.
Title: Old RA diagram
Credit: Own work
Author: Tfr000 (talk) 19:36, 12 June 2012 (UTC)
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
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