No, it doesn’t matter at all. As I pointed out to him above, he would have way to increase his odds of choosing the right birth info related to the people’s self-descriptions. Over time everyone would end up around 50%. It’s a coin flip. Regardless of what people mean by romantic and whatever adjectives they use in their self-descriptions, if these selfdecriptions lead to astrologers choosing significantly over chance in repeated experiments, they are getting information, somehow, in ways that do not fit current scientific paradigms. If they don’t they don’t. But the test absolutely present a way to test the hypothesis.
Even if we hypothesized that libras are more likely to select descriptions that contain the word ‘romantic’, if that’s a statistically significant result it would be noteworthy.
And further I included in the protocols that all the test subjects would have the same sun sign.
I do think there are other confounds, though. For example, in the US we have hard birth date cutoffs for school enrollment, so that kids born in August are effectively a year younger than some of their classmates born in July (and no similar gaps for kids born in March). That could affect personality later in life, and create a birth-month-based difference in adult personality without having anything to do with the alignment of planets or stars.
AGain this can easily be avoided by choosing all participants with birth dates in the same sign and the same month, and even the same year. There are factors in a chart that change very rapidly - the rising sign, and allow for significant interpretive differences, even between people born the same day. This eliminates theses kind of seasonal/schedule effects.
And any possible effects like this can also be used by teams to compete with astrologers. If they think somehow they can find some other explanation for how information like that needed to distinguish (either by clients or by astrologers) between descriptions, they can use those tools to compete with astrologers. If they think that those towards the end of the Capricorn period have some different qualities related to schedules or other cultural factors, they can use this information and try to achieve similar or better results than the astrologers, should the astrologers be getting significantly better than chance. But I actually don’t think there would be any if you restrict down to one sun sign. It is only one placement amongst at least 11.