There are many possible orders that someone could watch TOS episodes in.
Airdate order, production order, stardate order, season order and by stardate order within each season (thus eliminating overlapping stardates between seasons), alphabetical order, by order of quality according to the ranking in some specified source, etc. etc.
And then there are reverse orders: reverse airdate order, reverse production order, reverse stardate order, reverse season order and by reverse stardate order within each season, reverse alphabetical order, by reverse order of quality according to the ranking in some specified source, etc. etc.
But the possible orders that episodes can happen in seem to be 1) airdate order, 2) production order, 3) stardate order, 4) season order and by stardate order within each season (thus eliminating stardates overlapping between seasons),
And if stardate have a constant relationship to time units on planets such as Earth, then only 3) stardate order, makes sense for a historical ordering of episodes.
But if, for example, stardates relate to the strength of some variable factor that affects the speed of warp travel, so Starfleet officers can estimate the time for a specific trip from the value of the stardate, then stardates can go up and don over time and episodes can happen in 1) airdate order, 2) production order, or 4) season order and by stardate order within each season (thus eliminating stardates overlapping between seasons),
Airdate order, production order, stardate order, season order and by stardate order within each season (thus eliminating overlapping stardates between seasons), alphabetical order, by order of quality according to the ranking in some specified source, etc. etc.
And then there are reverse orders: reverse airdate order, reverse production order, reverse stardate order, reverse season order and by reverse stardate order within each season, reverse alphabetical order, by reverse order of quality according to the ranking in some specified source, etc. etc.
But the possible orders that episodes can happen in seem to be 1) airdate order, 2) production order, 3) stardate order, 4) season order and by stardate order within each season (thus eliminating stardates overlapping between seasons),
And if stardate have a constant relationship to time units on planets such as Earth, then only 3) stardate order, makes sense for a historical ordering of episodes.
But if, for example, stardates relate to the strength of some variable factor that affects the speed of warp travel, so Starfleet officers can estimate the time for a specific trip from the value of the stardate, then stardates can go up and don over time and episodes can happen in 1) airdate order, 2) production order, or 4) season order and by stardate order within each season (thus eliminating stardates overlapping between seasons),