June 25, 2011
On your birthday, the Earth completed another orbit — 584 million miles traveled since your last celebration.
Eclipse over the Acropolis
Birthday · June 25, 2011
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APOD published June 25, 2011. Credit: Elias Politis. A publication-date match, not a photo taken on your date. Independent of NASA.
The total phase of the June 15 lunar eclipse lasted an impressive 100 minutes. Its entire duration is covered in this composite of a regular sequence of digital camera exposures, tracking the dark lunar disk as it arced above the Acropolis in Athens, Greece. In fact, around 270 BCE Greek astronomer Aristarchus also tracked the duration of lunar eclipses, though without the benefit of digital clocks and cameras. Still, using geometry, he devised a simple and impressively accurate way to calculate the Moon's distance, in terms of the radius of planet Earth, from the eclipse duration. A more modern Greek astronomer, Elias Politis titled this eclipse duration study and the accompanying youtube timelapse video "Acropoclipse". What was that?: Help identify a mystery flash seen on Mauna Kea
Image credit: Elias Politis