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How did ancient people call this still a twin?

In the more modern images of the constellation Gemini it more looks like a twin: But in the old images when ancient people mentioned it, it doesn't look like a twin at all. But it was still called ...
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Why are sometimes the brightest star of a constellation not named alpha?

From the Wikipedia page of Alpha Ursae Majoris: Alpha Ursae Majoris, Latinised from α Ursae Majoris, formally named Dubhe /ˈdʌbiː/, is, despite being designated "α" (alpha), the second-...
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