Earth & city lights

Earth & city lights

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Credit: ERICH SCHREMPP / SCIENCE PHOTO LIBRARY

Caption: City lights. Artist's impression of a crescent Earth viewed from space with city lights showing on the night side. The velocity of the day/night boundary as the Earth rotates varies because the circumference of the Earth is different at different latitudes. At the equator it moves at approximately 1600 kilometres per hour (1000 miles per hour); at a latitude of 45 degrees it moves at about 1073 kilometres per hour (667 miles per hour). The Earth rotates once every 23 hours 56 minutes and 4.1 seconds.

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Keywords: astronomy, blue, cities, city, city lights, city lights from space, crescent earth, earth, earth science, earth's, earthrise, from space, light, lights, night, planet earth, sciences, spaceship earth, terminator

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