July 10, 2018
On the day you arrived, the Earth was spinning at a thousand miles per hour, orbiting the Sun at sixty-seven thousand.
Noctilucent Clouds over Paris Fireworks
Birthday · July 10, 2018
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APOD published July 10, 2018 · Video still. Credit: Jean-Luc Dauvergne (Ciel et Espace);. A publication-date match, not a photo taken on your date. Independent of NASA.
It's northern noctilucent cloud season -- perhaps a time to celebrate! Composed of small ice crystals forming only during specific conditions in the upper atmosphere, noctilucent clouds may become visible at sunset during late summer when illuminated by sunlight from below. Noctilucent clouds are the highest clouds known and now established to be polar mesospheric clouds observed from the ground. Although observed with NASA's AIM satellite since 2007, much about noctilucent clouds remains unknown and so a topic of active research. The featured time-lapse video shows expansive and rippled noctilucent clouds wafting over Paris, France, during a post-sunset fireworks celebration on Bastille Day in 2009 July. This year, several locations are already reporting especially vivid displays of noctilucent clouds.
Image credit: Jean-Luc Dauvergne (Ciel et Espace);