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The relativity of simultaneity, more than anything else, forces the view that time is not really passing. […] The idea is that if simultaneity is a relative concept, then it is impossible to think of space-time as being a stack of unique ‘nows’ that successively appear and vanish from existence. The past and future really exist.
Rudolf v. B. Rucker, Geometry, Relativity and the Fourth Dimension, p.117. Rucker cites Gödel’s paper, “A Remark about the Relationship between Relativity Theory and Idealistic Philosophy.”