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Birthday · October 22, 2016

Cerro Tololo Trails

October 22, 2016

Your birthday is not just a date on a calendar. It is the yearly return of a moment when the universe became more observant, more feeling,...

Cerro Tololo Trails

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APOD published October 22, 2016. Credit: Babak Tafreshi. A publication-date match, not a photo taken on your date. Independent of NASA.

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Cerro Tololo Trails

Original APOD · October 22, 2016

rly one moonlit evening car lights left a wandering trail along the road to the Chilean Cerro Tololo Inter-American Observatory. Setting stars left the wandering trails in the sky. The serene view toward the mountainous horizon was captured in a telephoto timelapse image and video taken from nearby Cerro Pachon, home to Gemini South. Afforded by the mountaintop vantage point, the clear, long sight-line passes through layers of atmosphere. The changing atmospheric refraction shifts and distorts the otherwise steady apparent paths of the stars as they set. That effect also causes the distorted appearance of Sun and Moon as they rise or set near a distant horizon.

Image credit: Babak Tafreshi

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