National Geographic Travelのインスタグラム(natgeotravel) - 7月15日 21時16分

Photo by @babaktafreshi
The World at Night project
An entire peaceful summer under stars is captured in this single 9-hour exposure on film. It was 20 years ago when I was 20, working as an editor in Iranian astronomy magazine, studying physics in Tehran, and often traveling to Alborz Mountains for stargazing.
The Earth rotation constantly rotates the sky above us and a long exposure shows this with star trails. When pointed north they circle around the north celestial pole, marked by Polaris. See how the North Star is not exactly on the pole, but about one degree off. Polaris is not one of the brightest stars in our night sky but its well located to roughly mark the north. Note the various colors of stars in the constellations Ursa Major and Ursa Minor.
Follow me @babaktafreshi for daily stories of the world under stars.
#twanight #longexposure #nightphotography #astrophotography #startrails #alamut @ナショナルジオグラフィック @natgeocreative

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