CHAOS VERSUS DETERMINISM IN MODERN CELESTIAL MECHANICS Smiliana Dikova Bulgarian Academy of Sciences Institute for Astronomy E-mail: SKYDYN@BGEARN.BITNET The present research reflects the paradoxical imperative of the modern knowledge:on the one hand, its progress requires narrow specialization, as far as it depends on the increasing technical possibilities.On the other hand, the modern scientists focusse on the issues of useful approximations and applications of the inves- tigations, and sidestep an issue the philosophical debate of the results. By present research I plane to discuss some of the funda- mental philosophycal terms- causation, determinism and predictabi- lity- in the light of new paradigm of modern Celestial Mechanics- Deterministic Chaos.