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If there is no day where you are then there is no night either.
False. Day is a causality. Darkness is the universal default state.
Thats irrelevant because darkness ≠ night. Night and day are both defined based on local observations (between sunset and sunrise).
:D
Inaccurate. For example, a location on the perpetually-dark side of an object is shrouded in "night", whereas the opposite side is always "daytime". The argument there is simply: does day/night depend on axial rotation of said object, or does it include the personal transit of a viewer across the boundary and thus cause the rising/setting of the dominant light source by that alone?
Regardless, darkness is the default state of the known universe.
Darkness and night aren't the same thing
You are correct, and that was not the point I made. See above.