Amrit S. ŠorliŠtefan Čelan Bijective Physics Institute, SloveniaScientific Research Centre Bistra, Slovenia sorli.bijective.physics@gmail.comstefan.celan@bistra.si International Journal of Fundamental Physical Sciences (IJFPS) 10 4 31-34 December, 2020 2231-8186 https://doi.org/10.14331/ijfps.2020.330139 This paper presents a bijective modelling approach that redefines time not as a fourth dimension of space-time, but as the duration of entropy increase within a time-invariant space. The authors challenge the conventional interpretation of Minkowski space-time and argue that the 4th coordinate is spatial, not temporal. The work denies the physical existence of time-arrows and time-reversal symmetry, proposing instead that all physical change occurs in a time-invariant space and that time is generated only through observation and measurement. The concept of psychological time is separated from physical reality. The study further explores EPR-type entanglement, entropy, and their implications for time as a discrete, observer-dependent phenomenon. Space-time, Entropy, Time-invariant space, Bijective modelling https://creativecommons.org/licenses/by-nc/4.0/