Why in ETC does PS2 go before PS1?

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    It's just because PS2 was discovered before PS1. – nc052 Nov 8 at 9:19

If your question is related to numbering, the photosystems were named in the order of their discoveries not participation.
In cyclic ETS PS-II doesn't participate at all.

PS-I would have gone first if PS-II was named PS-I.

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