August 4, 2004
Another birthday means another year in which the universe got to experience itself through your particular combination of wonder and will.
Solar Arcs and Halos
Birthday · August 4, 2004
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APOD published August 4, 2004. Credit: Eva Seidenfaden. A publication-date match, not a photo taken on your date. Independent of NASA.
Have you ever seen a bright halo around the Sun? Unusual halos and arcs were so bright one recent afternoon in Trier, Germany that even casual people on the street noticed them. The fantastic sky display is pictured above and included a 22 degree halo arc, a complete parhelic circle, a circumhorizon arc and even an infralateral arc. A computer simulation has been run that mimics the above rare display. A cloud partially blocked the usually more intense direct glare of the Sun. Sunlight refracting through falling and fluttering hexagonal ice crystals creates such displays. Such atmospheric ice crystals also cause sundogs and Moon halos.
Image credit: Eva Seidenfaden