At the moment, absolute pitch seems to be using 12et, with A=440 Hz. Would this have been the case, say, in the Baroque period, when A=quite a bit less than 440 Hz? With some orchestras using 442 Hz, and other variants, does this actually affect people with absolute pitch? Or is it more like 'Yes, it's a green colour, but not exactly the shade I had in mind'.
Edit: I have in mind not what pitch various orchestras played an 'A' at - that is available from many sources, and has varied considerably. More along the lines of someone now with AP can say "That's an A", whereas two or three centuries ago, it wouldn't necessarily have been the same note. Hopefully this will clarify the question I'm trying to ask.
Another edit: this has little to do with the tuning base of orchestras over time, more to do with what a note was recognized by someone possessing AP/PP when in fact, an 'A' could actually have been what is now, for example, a G#. Would they say A or G#, for instance. I'd hoped the header may have revealed the quest. Perhaps there are more apposite tags?