月光下的冰光环
(原标题: Ice Halos by Moonlight)
2022-05-14
浏览次数: 16
4月15日，一轮近乎满月的月亮在加拿大阿尔伯塔省北部的春夜出现了这些明亮的景象。那天晚上，明亮的月光被高云中的六边形冰晶折射和反射，形成了一种复杂的光晕和弧线，这在白天的天空中更常见。虽然弧线和月狗或副月影的颜色只能用肉眼看到，但我们使用了30秒到1/20秒的混合曝光来渲染这幅月光下的广角天景。画面上方的北斗七星位于微笑的彩虹色环天顶弧上方。大角星在左，轩辕十四在右，月球的中心是它经常有斑点的22度光晕。5月15日也将看到明亮的满月在地球的夜空中闪耀。明天的满月会有一段时间变暗，因为它会在月全食中穿过地球的阴影。观察：5月15-16日月全食
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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. Watch: May 15-16 Total Lunar Eclipse
© Alan Dyer