In a diurnal chart, the heat and dryness theoretically counteract the cool and wet nature of Neptune. Conversely, a nocturnal chart would seem to amplify the effects of Neptune in this sign (or any sign). I have not done any research to see whether those of this generation with the greatest impact with regard to these issues came from one sect more predominantly than the another.

More information on each of the planets in Gemini:

Sun	Moon	Mercury	Venus	Mars
Jupiter	Saturn	Uranus	Neptune	Pluto
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