Astronomer Hipparchus of Nicea [today's Iznik] made the major discovery of precession in astronomy by comparing observations centuries apart. Hipparchus proposed that the axis around which the heavens seemed to rotate shifted gradually over 26 000 years
-spof.gsfc.nasa.gov/ stargaze/ Sprecess
a physically active meditation granting the worshipper "the thought of the unseen world and of his dependence upon it.
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