- 6 months is the maximum length of a day of the poles.
- Cause of the phases of the Moon is rotation of earth.
- Christian Huygens was the first to speculate that Venus is completely covered with clouds.
- Twelve constellations referred to as zodiac, are a group of stars.
- Giordano Bruno was the first to determine that the day on the Mars was, like our, roughly twenty-four hour long.
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