October 04
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1582 – The Gregorian Calendar is introduced by Pope Gregory XIII.
1883 – The Orient Express, a transcontinental railroad on Earth, begins service between Paris and Istanbul.
1957 – Launch of Sputnik I, the first artificial satellite to orbit Earth.
1959 – The Russian satellite Luna 3 is launched, orbiting the Moon and photographing 70% of the Moon's far side.
