The sun is classed as a green star[1]. As a black-body object, it emits the most light in the green spectrum. We see white because we evolved to distinguish color based on our star; however, our ability to detect variance in brightness in colors is far more limited.

We, in fact, use this to our advantage. View screens transmit exactly brightness in narrow red, green, and blue such to fool our eyes into believing we see colors there that are not in fact there, such as red and green light to simulate yellow light.

[1] https://en.wikipedia.org/wiki/Green_star_(astronomy)

But chlorophyll doesn’t absorb green, it absorbs other colors !

Blue and red are the maxima but chloropyll does absorb green light too - just less of it (and possibly less efficiently). The article claims "[plants] absorb only about 90% of the green photons." which seems to be a typo and should be absorb 10% or reflect 90%. I'm having great difficulty obtaining complete absorption spectra from the literature - nobody seems to have bothered investigating since the 1950s (https://sci-hub.se/https://pubs.acs.org/doi/10.1021/cr60147a...) with most modern papers seemingly content with declaring the red/blue maxima and not giving the full range.

The paper I linked shows nonzero absorption for greenish wavelengths approaching 10% towards yellow - which would marry with my interpretation of the article's typo.

Fyi all your posts seem to be dead on arrival, I've gone ahead and vouched for them but you should email dang and see if your account has been flagged for any reason.

After passing through the atmosphere, the sunlight is strongest in the green (of the visible spectrum).

The sun barely looks different from an artificial blackbody of the same temperature. The atmosphere is not a big consideration here.

Aha. When looking at a spectrum recorded through the atmosphere, that's how it has to be reported (so that's my thinking, why I would say it like that).

Now.

What color was it when plants evolved?

On a planetary scale that's like yesterday.