Astronomy Picture of the Day——北半球春季天空的精彩天象

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

High lights of the North Spring Sky

Image Credit & Copyright: Universe2go.com

Explanation:What can you see in the night sky this season? The featured graphic gives a fewhighlights for Earth\'s northern hemisphere. Viewed as a clock face centered atthe bottom, early (northern) spring sky events fan out toward the left, whilelate spring events are projected toward the right. Objects relatively close toEarth are illustrated, in general, as nearer to the cartoon figure with thetelescope at the bottom center -- although almost everything pictured can beseen without a telescope. As happens during any season, constellations appearthe same year to year, and, as usual, the Lyrids meteor shower will peak inmid-April. Also as usual, the International Space Station (ISS) can be seen, attimes, as a bright spot drifting across the sky after sunset. After the VernalEquinox next week, the length of daytime will be greater than the length ofnighttime in Earth\'s northern hemisphere, an inequality that will escalate asthe spring season develops. Also as spring ages, Jupiter becomes visibleincreasingly earlier in the night. As spring draws to a close, the month of Maywill feature the third of four full moons of the season, one of thedefiniitions of a Blue Moon.

北半球春季天空的精彩天象

说明：在春天的夜空，能看到什么呢？这幅图片呈现了北半球天空的一些精彩。在图片下方以钟面为中心的影像里，早春事件成扇形向左散开，而晚春事件则向右侧散开。一般来说，相对接近地球的事件都被绘制在底部中心使用望远镜的小人附近；然而，不使用望远镜，我们也可以看到图表中大多数事件。与任何季节一样，星座还是一如既往地出现，天琴座流星雨在四月达到极大期。而国际空间站则像平时一样有时可能被看作是日落后掠过天空的一个亮点。下周春分之后，地球北半球白天的时长将大于夜间，这种不等将随着春季的发展而变大。同样，随着春天的到来，木星在夜晚会出现的越来越早。随着春天的结束，五月份会出现两个满月，第二个满月被称为蓝月亮。