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Why the day is 24 hours long: Astrophysicists reveal why Earth's day was a constant 19.5 hours for over a billion years


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W Herschel used a 10 foot telescope to study the Sun in 1801 and hypothesized that the sun was a solid Earth-like sphere with atmosphere. 60 years later, J Herschel noted that patterns on the solar surface could be igneous snowflakes, giant fish swimming in the photosphere, or monsters