An almost full moon on April 15 brought these luminous apparitions to a northern spring night over Alberta Canada. On that night, bright moonlight refracted and reflected by hexagonal ice crystals in high clouds created a complex of halos and arcs more commonly seen by sunlight in daytime skies. While the colors of the arcs and moondogs or paraselenae were just visible to the unaided eye, a blend of exposures ranging from 30 seconds to 1/20 second was used to render this moonlit wide-angle skyscape. The Big Dipper at the top of the frame sits just above a smiling and rainbow-hued circumzenithal arc. With Arcturus left and Regulus toward the right the Moon is centered in its often spotted 22 degree halo. May 15 will also see the bright light of a Full Moon shining in Earth's night skies. Tomorrow's Full Moon will be dimmed for a while though, as it slides through Earth's shadow in a total lunar eclipse.?

4月15日，一輪近乎滿月的月亮將這些發(fā)光的幽靈帶到了加拿大阿爾伯塔省北部的一個春夜。那天晚上，明亮的月光被高空中的六角形冰晶折射和反射，形成了白天天空中更常見的光暈和弧形。雖然弧線和月亮狗或副天狼星的顏色只能用肉眼看到，但這幅月光下的廣角天景使用了30秒到1/20秒不等的混合曝光。畫面頂部的北斗七星位于一個微笑的彩虹色環(huán)繞天頂弧上方。大角星在左邊，軒轅星在右邊，月亮的中心是經(jīng)常被發(fā)現(xiàn)的22度光環(huán)。5月15日還將看到明亮的滿月之光在地球的夜空中閃耀。然而，明天的滿月將在一段時間內(nèi)變暗，因為它在月全食中穿過地球的陰影。