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#Mon Aug 09 11:50:40 CEST 2010
Text__abCKQKObEd-WfYQ0GneCwQ_title=Astrolabe
Text__abCKQKObEd-WfYQ0GneCwQ_text=<p>The sky is projected onto a circle. A pivoted disk specifies the visible horizon. Sights on the rear of the instrument serve to measure the height of a star above the horizon.</p>